Case and MB are good parts.
Sounds like the 7600 will work for you and light gaming.
If you can afford it, get the e6420, it has a better multiplier for O/C
That RAM is very expensive, you can find good stuff for $90 now.
Heard people say Lite-on is not the best DVD. Look at a Samsung for the same price.
The Antec Smartpower is their lowest rated model. Look at the FSP 430.
I got the same case last week and modded it a bit. I like it so far but then the build isn't quite complete (waiting on some fans I ordered).
I wouldn't get the Rev 1.3 DS3. I would go with the Rev. 3.3. ClubIT has it for $123 including shipping.
I wouldn't get a E6XXX unless you want to go big and get the E6600. It just doesn't make any sense to me when you can get an E4300 or E4400 and OC them. If you are planning on overclocking even just a little, you just don't gain enough to justify the price difference IMO.
So I guess my suggestion, aside from what the other two fellows said about the DVD and RAM, would be to get the better mobo. Get an E4300 or E4400 and then use the extra dough toward a better video card. Maybe a 7900GS or something.