there is onboard raid if you use SATA drives. i would look at the DFI lanparty SLI board... its sexy. i think it takes DDR2 memory though, and of course, you have to buy an pci-x graphics card. I too am upgrading my machine, although i need more money. I currently have about $1000 in savings.
If your an avid gamer, i think your choice of parts is excellent, although if your going to be multi tasking or using photoshop alot or any 3d programs, an intel socket T may be better for you. The 630's look really nice, and so do the 660's (but the price is absurd). I love intel, and i love AMD, the thing is, i do alot more than just game, which is why im probably going to buy an intel 660.
If you dont already, definately start reading up on parts and reviews. A
GREAT site i frequent is
www.ocforums.com. i spend alot of my time reading reviews and looking at project logs and other things there. Plus, you can usually get the best deals on parts, and sometimes excelent deals on used parts in the classifieds (have to have 100 posts).