If just for games, the CPU doesn't matter.
http://alienbabeltech.com/main/?p=13034
http://www.overclockersclub.com/reviews/athlon2_620/
The only important parts likely to change are 1: the GPU when Nvidia finally comes to the table and 2: the motherboard if you might be interested Lucent's Hydra tech that can run different GPUs together like your GTX with a GTX260 or even an ATI card.
http://alienbabeltech.com/main/?p=13034
http://www.overclockersclub.com/reviews/athlon2_620/
The only important parts likely to change are 1: the GPU when Nvidia finally comes to the table and 2: the motherboard if you might be interested Lucent's Hydra tech that can run different GPUs together like your GTX with a GTX260 or even an ATI card.