Building i7 920 system

Hi SDers,

Current specs are

Core2Duo 8400 @ 3 GHz
2x2GB Corsair @ 1066 MHz
Geforce 8800 GTS OC'd to 650 MHz core clock

I'd like to upgrade those 3 things plus the power supply (and mobo obviously). I have a good case and hard drives.

I'm looking at a system based around the i7 920 core, perhaps SLI or 1 nice gfx card

bugdet is $600 but can be stretched if necessary. Obviously not looking at the top of the line, but more like medium-to-high-medium of the line... What have you got fellow SDERS??!!

Thanks!