i've heard from another user on here that they greatly enjoyed their g930. then i've read reviews about how people dislike it. honestly i'm not sure what to believe in terms of quality. it seems like one of those products which either fits your needs or it doesnt. still nowhere near what you can expect from good headphones though.
i'm not sure how they will work with all of the interference you mention (i'm guessing you are moving to a college dorm?). they could be fine or they could act up. i cant promise you anything in that regard.
--
first i would like to say... since you mentioned amazon.ca i take it you are from canada. be aware that you also have ebay.ca you can deal with. also you can probably have items shipped from the usa to canada correct?
--
for clarification the audiotechnica model numbers ATH-
M50X: new version which has removeable cables and comes with 3 styles.
M50S: old version with long straight cable (this is what i have and the cable is really long... but thats good too)
M50: old version with short coiled cable
as i said i personally own this pair of headphones and i definitely do like them however as i said before some people might not like that the soundstage is supposedly a bit narrow. i suppose this is the reason why it sounds like all the sound is coming from close around you however to me i always felt that it was more immersive that way. i'm not sure what your feeling are on that.
i do like the sound they produce. they are slightly warm sounding and dont have sharp ear piercing highs like some sets do. while not the bassiest headphones around they are more than capable in that regard. some say that they focus more on mids and highs and that mids are a bit weak however i've personally never thought they sounded bad in anything i've pushed through them.
they are easy to power with any device so you shouldnt need an amp of any sort.
they are built very sturdy and are foldable. this makes them nice for traveling back and forth to places. mines been through a knapsack for several years without breaking so far. i also love the cable. its thick! and it has a solid metal end with a metal spring strain relief (not a rubber molded one).
the only cons i can say about them are the soundstage (covered earlier) the fact that they get a bit hot if you wear them a long time (all closed headsets are like this) and that the pleather pads will eventually need replacing if you wear them alot (sweat hardens them... but this is quite common for most headphones)
a great set of headphones if they fit your need.
--
an alternative would be the dt770. its really not out of budget... please see this link http

/www.ebay.ca/sch/i.html?_sacat=0&_from=R40&LH_BIN...
they look to be shippable from the usa to canada for $185 free shipping (take your pick of the 250 or 80)
they are available in 32, 80 (both which compete with the m50) and 250 ohm models (the 250 may need an amp but it sound great).
they have a wider soundstage than the m50s do and are probably one of the wider soundstages you will find for closed headphones in your budget range.
they get as much praise and hype as the m50s do for quality of sound. the 250ohm version also can hit pretty hard. i've heard it highly recommended from someone who tried all 3 versions out.
they are not foldable like the m50s but i've heard they are very comfortable.
this would be a great set as well and might be better suited for gaming (although this all comes down to personal preferences... audio is a very personal thing).
--
as far as microphones are concerned... the 4 choices i would suggest are:
blue snowball, audiotechnica atr2500, samson co1u or modmic.
(what i didnt mention is the blue yeti or at-2020usb+ because of cost... but i'll come back to that in a moment).
--
a few factors to help narrow it down?
-did you need to be able to hear the input from the microphone in your headhones? if the answer is yes then you want one with a microphone jack.
-did you need to record things other than a single voice? for instance a duet commentary or perhaps music? if the answer is yes then you might want to get one with multiple recording modes. however, for most things standard cardioid mics work fine.
--
the blue snowball is a highly respected mic for amateur youtubers. it has good quality and is fairly inexpensive. it also has multiple pickup patterns. it doesnt have a headphone jack though. this is a very good mic to start out with for youtube however some may outgrow it quickly.
the atr2500 is comparable to a cheaper built at-2020. its not built as nice but i've heard audio quality is pretty good. it also has a microphone jack but only one pickup pattern. if possible i would splurge for the full at-2020 (see my note about that later) but this might work.
the samson co1u is comparable to the atr2500 in quality and that it only has a cardioid pickup pattern but it doesnt have a headphone jack. also not a bad mic for on a budget.
then there is the modmic. this is a boom mic which attaches directly to your headphones. they are shipped from the modmic website and are rather hard to find anywhere else. the cost is rather low at $40 but they get good reviews. if you really would like to spring for a high quality mic (below) but are worried about budget right now you could always get a modmic now to use for gaming and recording then trade up to a better mic when you can afford it. then you can always keep the modmic when you're playing causal or when you are traveling (like if you went home for the weekend) and keep your full setup at your dorm.
if you went for the idea above about trading up in the future then the two i would suggest are the at-2020 and the blue yeti. both are EXCELLENT microphones with great quality. they sound better than the others i listed. as far as which you want... that depends on your needs.
the blue yeti has multiple pickup patterns and a headphone jack. the at-2020usb has only cardioid and no headphone jack while the at-2020usb+ (note the plus symbol or plus text added after the usb part) has a headphone jack. they are what some of the professional youtubers are using.
i've seen the yeti on ebay.ca for $120 and the 2020 for $140.
--
TLDR? or just wanted a recap?
the m50s is a nice pair of headphones but i'd be tempted to suggest the dt770 instead (if you get an amp the 250ohm version might be great!)
if you were game to get a high quality mic in the future or if you managed to fit it in budget now i'd go with an at2020usbplus or blue yeti in a heartbeat. if it was to be in the future i'd get a modmic for temporary audio. its no slouch and i've heard is quite excellent for the low cost.
if you didnt want to upgrade in the future or wanted something cheaper i'd spring for the blue snowball or possibly the atr2500 (though some question its durability).
--
as for what works best for you? thats hard to say but i've given you a few choices in your thread and recapped here.