I have bought a few 9400GTs by EVGA and I have to say it is a very nice card for basic computing and some gaming (even though it is on the lower end of gaming cards).
Has a nice cooler on it
and is low power (does not require a 6pin connector)
If your main focus is gaming you ought to step up to something better. Like a 9800GT for starters which you can get these days for $114 which is a bargain for the amount of processing power you get. Incredible bang for your buck.
yes your MOBO is ok. your have the fastest ram you can have(i dont know the timing, i assume its maybe some value ram but its still 667), you PSU can push it and a C2D 2.2ghz is enough even if you go for a 9800gt.