well right now drivers are still an issue with some games and apps in 64bit vista, so that might be an issue depending on what you would want it for.. but I agree with b1gapl on the board and PSU... over kill to me what you have... I have a 600W psu and it WAY to much for what I have... (which is similar to your wish list) I know it sounds stupid, but what about DVD burner, monitor, etc... I'm assuming you have those..
I would even go so far as suggesting XP until they come out with SP1... bugs, bugs, bugs with vista and all my OS developer friends are stating... (they are the ones telling me to hold off as well) but over all it looks like a start of a pretty good build