Single 8800gt is a lot better and comes in only a bit more than the 2x 8600.
Newegg.com - ASUS P5K-E/WIFI-AP LGA 775 Intel P35 ATX Intel Motherboard - Retail
I recommend the asus line for overclocking (most people will go with gigabyte, also a good choice)
Asus has improved memory performance and this board comes with WIFI so if you have wireless or are taking the comp anywhere, its a nice feature. Other than that, its the board i wanted to get and my current board is great so this one must be excellent
Edit: And i would maybe change the power supply
DoubleEdit: Newegg.com - ASUS MAXIMUS FORMULA LGA 775 Intel X38 ATX Intel Motherboard - Retail
Thats a really good board if you want to spend the money, and has crossfire if you want to in the future.