I'm new here, I've read up on a couple of threads and I love how helpful the community becomes. I have gotten some ideas for video cards, mobo, processor etc. but I don't think these are up to date and I want to be able to run the most recent games like COD: Black Ops, Starcraft 2, Burnout, TF2 and so on..
You are wise, your build is fine, you have read the 'Best XXXX for the Money' articles, go for it.
I got a very cheap AM2+ Asrock Mobo (about 50 USD) and unlocked a x3 to an x4 and switched on the auto overclocked and ended up with x4 @3.5ghz that got 7.3 in the WEI - took about 2 seconds to do, solid as a AS-rock (sorry)!
Your build will play the games you mention very well at stock, and its as upgradeable as anything would be for the price.