CPU and Mobo seem fine. The RAM is good (but for gaming go with Corsair XMS or some high quality stuff if you have the mula). Hard drive is good enough, same with DVD drive. The power supply is good enough, although I'd rather put money into an Antec power supply just because I trust them ::shrugs::
I agree with the Colonel. Do not do SLI. For the cost of it, it does not provide as much of a jump as you may hope, just not worth the money. And I would actually (if possible) not buy the computer until DX10 comes out and just start off with a DX10 card (instead of having to upgrade in a month or two).
Also, one thing I like is I have two optical drives. A DVD-RW/CD-RW combo drive (it can burn anything pretty much) and a straight up DVD-R drive. I just find it easier to have two because most games are on DVD's now so I can put two game CD's in for my two favorites, and never have to change CD's when I want to play diff. games. Just easier in my opinion.
Case wise, I'm a big fan of Aspire's cases because they have a lot of fans. The bad thing is they have a lot of fans, therefore a lot of noise. Warriorscot has a SuperLanboy which is a good choice, good airflow and lots of room. Do some shopping around, link what you find and we can 'review' it for you