I'd stick with that WD, it's a fantastic drive.
Don't like the NEC reviews. Can you get a Samsung instead, for example?
I assume the PSU is a 550VX, right? It's good.
On the whole, yeah, go for it, it will be a great PC.
Edit: CPU - if you spend most of the time playing games, and you're not into Flight Simulator, then the E8400 is a better choice than Q6600, no worries.