Actually, that Gigabyte board you suggest Ferrari has Crossfire support. However, if you flash the BIOS to F5 then SLI is also supported. There's quite a few X58 motherboards that supports both SLI and Crossfire (its the only chipset that does anyway) it just depends on the price and model. See the board's specification here.
If you can afford it, Core i7 setup is good. It performs quite well and you would be able to upgrade your CPU without replacing your motherboard.
With the Core 2 Quad setup you picked, that's pretty much the highest you can go. Intel is not going to make any high-end LGA 775 compatible CPUs because they're going to stick with the LGA 1366 socket.
Thanks that helped alot . I guess I'll be getting a core i7 then . Specailly if that mobo can support SLI that would be great . Then when I want to upgrade I can just get another vid card and put them together.
I'll look at it later today hopefully and post my final build agin .