If thats the highest you can go with your money then get the 3rd built.
Build 1 is not good at all.
Build 2 has a good CPU but only microATX wich is not too good for gaming builds.
Build 3 has a good CASE, MOBO and a decent CPU.
But thats just my opinion, would help if you would tell me your budget.
If you can go up to $832.86 , then get this built:http://img842.imageshack.us/img842/1115/55420285.jpg
It's the basic i put together for anyone with budget round $800