Ten60,
as Gyrene posted...if you really want to stay with AMD for the CPU but want to go for a Nvidia graphic card, make sure you get the correct MB with the nvidia ( or nforce ) chipsets for the north bridge and south bridge for better compatibility.....
the MB you chose is more compatible with an Ati graphic card verses that Nvidia graphics card you listed
I would also recommnd a good quality PSU ( Power supply Unit ) with a 60amp single 12V rail, instead of a PSU with 2 or 3(or 4 ) lower 12V rails on it that only have like 14amp/18amp/20/amp etc ratings.......
as for the cheap case....when looking for a good cheap case ( that you will not have to modify later )
some things to look for are:
- PSU mounted in the bottom
-plenty of openings to add case fans 90mm/120mm/140mm/200mm fan sizes
the bad thing about most prebuilt computers is the case design... they come with hardly any air vents to get proper air exchange ( get the cool air in / hot air out )
like Dell, HP, SystemMax, Acer, etc......
don't go to cheap on the case....or all those more costly components could become damged due to excessive heat build up
hope this helps
TC