did not see any bundle deal in that link to comment on bundle price but i can give my thoughts on the products themselves.
i personally own an ath-m50s (previous version to the m50x). while i do personally like it there are certainly caveats to be made aware of. first is that they have an incredibly small soundstage which makes it not very ideal for gaming. things will sound close and in your face (i like this for the music i listen to on them) and less airy and 3d. second is that for similar price the dt770pro (though it needs a soundcard or amp to sound best) is better in every single way. third is that they are not good for large ears, glasses and get hot after awhile. as far as the good things: nice warm bassy sound without sacrificing on treble, they are built like tanks, they fold up and the cables provided (at least on the original version) are very thick and durable.
if you liked the m50, i'd suggest looking into the dt770pro instead. otherwise, i would like to suggest open headphones with large soundstage for gaming tasks unless of course you require closed for isolation.
as far as the blue yeti is concerned its an excellent microphone. good sound quality, multiple pickup modes and is not terribly expensive. as for negatives, its really big!, a bit higher priced than competitive products and gives you more features than you really need.
a good alternative to the yeti is the at2020usb/at2020usb+ (plus version has jack for headphones, non plus does not. keep in mind if you use the plus version you're going to need a headphone amp generally if you use the jack.) or the atr2500 which is a budget version 2020 with poorer build quality and somewhat less sound quality. in terms of pure convenience the modmic is an attachable boom mic which converts any headphones to a headset and is a great choice as well.
if you want better advice, you really should provide much more information.
-open or closed design? open generally has better soundstaging while closed does not but is isolating.
-what kind of sound signature do you like? eg. lots of bass not much treble, neutral, more treble than bass, punchy but no deep bass, easy listening, detailed.
-budget? does this include soundcard / amp or not?
-do you have a large head or glasses?
-what purposes are the headphones for? gaming, music, travel, etc.
-what genres?
-do you want headphones which sound more exciting or ones which give you more advantage (in fps gaming) but are not exciting sounding?