that processor is a terrible choice for gaming. It has low single threaded performance which games rely heavily on. You reall would be well served to change this to an IVB build if you want to game.
The GPU is fine though. The GPU will run all games maxed out at 1080- just fine.
You are also going overboard on the GPU. 450 watts is more then enough save some cash and ditch the 750 for a 450
If you do not plan on overclocking then you can go with an i5-3570k + H77 micro atx mobo
If you want to overclock then you can go with an i5-3570k + Z77 mobo
i5 210 + 70 H77 mobo so it would cost you 280 dollars or about 320 dollars if you want the overclockable Z77
you are paying 145 for the mobo and 210 for the chip thats 355 dollars. That's just insanity. You can get an intel chip for the same price as that amd chip and the intel chip will blow it away in single threaded and a lot of multi threaded too. And their are plenty of good lga 1155 motherboards for the same 145 dollar price or even less.
Switch your build to intel. Just trust me on this one. For the same price you will have a much better system if you go intel.
You will have better framerates i 100% guarantee you this if you switch to an ivy bridge build over a pile driver build.