I don't know if you already have an OS but if you don't, you'll have to tack on another 100 or so smackaroos
Also I've been out of the loops for a few months but I'm not sure that you would get a reasonable performance boost from two 8600gt's in SLI. I've owned a few of the 8600's and I wasn't really impressed at all with them. For about the same price you can get a single 8800gt, which I guess is the bees knees from what I've been reading. Plus down the road you could always pick up another 8800gt I guess. I'm actually waiting for a response myself about it in my thread but it's at least worth looking into.
Also, also, that is an awesome deal on that Corsair XMS I'd jump on that like I would jump on Kathleen Robertson if she left me an opening.
Sounds great buddy! I'm jealous though I wish I could throw down for a Crosshair, but instead I need to upgrade my vid card :/ Haha oh well