I have a Gaems G155 gaming & entertainment mobile system with an Xbox 360 for when I travel. My 360 bite the dust and I'm tired of wasting money on consoles. My plan is to build a custom mini-itx computer to be secured inside the G155. I have a i3-3220 lying around from a previous build and I plan on pairing it with a Gigabyte Ga-H77N-Wifi board. I picked up a Silverstone 450W sfx psu to power this crazy idea of mine. My main problem is finding a gpu to run games like BF4 & Arkham Origins at a constant 40fps without sacrificing all of the details. The built-in screen is a 15.5" 720p LED display. I have about 4.0-4.5" of clearance in order to close the case. I've looked at Sapphire 7750 lp and a Zotac GTX 650 lp, however I want more bang for my money.