This one is great if you want a 24 inch one.
http://www.amazon.com/gp/product/B00PC9HFNY/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B00PC9HFNY&linkCode=as2&tag=toxislay00-20&linkId=LGKPTRYHUJRNWAJD
If you're looking for a bigger monitor here's a 28 inch for around the same price...
If you don't care about a microphone, you can go with these audio technica headphones. They have great sound quality for any type of gaming or listening to music. They are the same price of the hyperX cloud 2's but have better sound quality...
For under $1,500, this is a really good choice. It has an 17-5700HQ, 16GB of RAM, a GTX 970M, and a 1TB HDD. The cost is $1,300 and for that price it's really great for gaming along with graphic designing, video editing etc...
You can take a look at these. They don't cost too much and are very portable while packing a lot of bass.
http://www.amazon.com/gp/product/B009JXHTNU/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B009JXHTNU&linkCode=as2&tag=toxislay00-20&linkId=2HBFISLVUYXZJ6WP
I would take a look at this laptop. It has an i7-5700HQ, 8GB RAM, a GTX 970M (amazing for gaming), 1TB HDD + 128GB SSD. The screen is 15.6 inches and only weights about 5.5 pounds so it's great for portability. The price is also $1,330...
This is probably the best you're gonna get for under $300. It goes up to 1080p resolution.
http://www.amazon.com/gp/product/B00SIZGUSK/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B00SIZGUSK&linkCode=as2&tag=toxislay00-20&linkId=AF7S47GOKNJBDLWT
These headphones are great. They are open backed and will be great for gaming and music. I personally don't like the color, but if you wanna spend the extra $30 you can get a sexy black color. They are also known to be VERY comfortable...
How big of a speaker are you looking for? This one is pretty portable.
http://www.amazon.com/gp/product/B011IH685E/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B011IH685E&linkCode=as2&tag=toxislay00-20&linkId=GFBHSJJCIDC2N5SH
Or are you looking for more of a multi stereo type...
You can check out these audio technica headphones, I have a pair and they are more on the bassier side especially if you use an equalizer.
http://www.amazon.com/gp/product/B000ULAP4U?ie=UTF8&camp=1789&creativeASIN=B000ULAP4U&linkCode=xm2&tag=toxislay00-20
Like the other guy said, the...
Maybe something like this? It's a desk stand for your microphone. The reviews say that it's strong enough to hold the blue yeti microphone so you should be fine. It doesn't clip to anything so you can freely move it around...