>the 955 is the C3 revision or still a C2 one.
Ye... that sucks a bit. The CPUs are labelled the same... so it's only an add. service when the shop lists the stepping.
>Gigabyte GA-MA790X-UD3P then I can save money on the RAM
You also could step down to a cheaper X3 witch also has enough power for gaming if you wanna save some bucks somewhere. Simply because I'd aim for 4 GB of RAM. With 4 gig you don't have to care about RAM for a long while.
The GTX260 would fit fine into the system. Alternatives would be a cheaper ATI 5750 (25% less power, but DX11 and low power consumption) or a waiting for an ATI 58xx.
Oh and perhaps looking for another CPU cooler... only cause the AC is listed next to the CPU doesn't mean that it would be the best choice. The AC stuff is fine, but you can get some better stuff. Depends on your pocket and ear size.