recommended gpu and case

[willish]

Hi, everyone
I am building a computer for recording/ gaming purposes. this is what I have so far http://ca.pcpartpicker.com/p/6wYPpg
I don't really know about a case or a gpu.
I don't want to get out of hand with spending but I want it to run games fairly decently. For the GPU I would like to spend in between $100-$200, I would like it to be a radeon that can be crossfired in case I want to add another card. The case I would like to be as cheap as possible.
Could anyone point me in the right direction? Thanks.

 

[Zerk2012]

Their no reason to think about running 2 cards with that motherboard since the bottom slot is at X4 speed. Also no reason to spend any money on the thermal paste what comes with the cooler will work just as good.
http://ca.pcpartpicker.com/p/Nz9jrH