I know you were probably looking for SLI in the future, but the benefit ain't really worth it. You should've gone for a cheaper P35 board and used the money to get a Q6600, but it's still a decent rig. Maybe try and sell it to someone for profit, or at least in line with what you pay for it and rebuild?
As for the RAM, (man I'm basically repeating vernong here
), you can't do anything about it until you get a 64-bit OS, in which case, you'll have some compatability issues to deal with, particularly with games, as 64-bit OSs aren't the best for gaming, which I assume that's what your rig is for. Maybe pull out two of those sticks and transfer them over to your new build, once you sell that one, it'll fix a lot of your problems.
Trust me, I just made a build recently and I regretted it. I bought the parts total at $590 with MIR and sold it after 1 month's use for $700. You might be able to pull something just as well.
The case will definitley impress, it's Intel, everybody knows Intel, and 500GB hard drive is more than usual compared to what you'd get at Best Buy, throw in the words "Core 2 Duo, SLI-capable, Nvidia, Vista" and you'll be set.