A good friend and I purchased comparable systems roughly about the same time. He went the i5 route, I went the AMD Phenom II 965 black edition route. He got a newer 240, I went w/2 9500GTs in SLI. We both went with Windows 7 64 and 4GB RAM.
We play BF:BC2, CiV, WAR, and a ton of other games. He has had constant issues with odd disconnects, random hardware conflicts, BSODs, etc... with every game so far. None here. I have heard the intel chips are wonderful when you are an experienced PC enthusiasts and someone who likes to O/C and tinker, but I would suggest an AMD to anyone who wants true plug and play with minimal complications.
I have also heard the rumor that AMD is for gaming while Intel is for data crunching but I can only speak from personal experience so, there's my 2 pennies.