Wow^
I believe thats enough for a nice Nehelem (Core i7) build.
Im not an expert in that area, but i can tell you to look at the new Intel 920 processor. its about $300 at Newegg.
The motherboard will also cost around $300 and there aren't many to choose from as Core i7 is pretty new.
The new memory standard for these is DDR3. That is kind of expensive but not outrageous. 2x 1GB kits can be had for under $70.
You will prolly want a nice video card too. The ATI 4870 seems to be a favorite around here. That can be found for well under $220.
Thats $890 right there. Add in a nice PSU and case and you have yourself a rockin' new computer. Other users will give you specifics.
Good luck!