Please save some money and get yourself 2GB more RAM whenever you can. I see a growing trend on this site of people getting only 2GB RAM with their new gaming PC's. You
need 4GB if you have a half decent CPU and GPU with windows 7 to get the maximum performance, remember your RAM should never be the bottleneck since it can be upgraded in parts and is relatively cheaper to do so. And make sure you get 64-bit windows 7 whenever you add more RAM.
Apart from that I would say bad choice on the PSU but other than that it's a sweet PC which should serve you very well, happy gaming.