CPU: The triple core is actually better for gaming. I'd save the $30 bucks.
Mobo: That's a good board, as long as you don't want USB 3/SATA III support.
RAM: Not a good choice. Those sticks are slower (especially if you overclock), and OCZ is known to have compatibility issues. I'd definitely stick with the faster, more reliable G.Skill sticks.
PSU: Also not a good choice. You really want to get a quality unit, which means sticking to the top brands (Antec, Corsiar, Silverstone, SeaSonic).