amd is close to bringing out a new cpu with 4 cores.. maybe u should wait a tiny bit.
Not until 2007. And Quad Core isn't really all that necessary yet, if ever, unless you're running a server or doing some serious multi-tasking.
That motherboard looks good, Asus is really on the ball lately, even with BIOS updates and what not. However, if you can afford it, the 680i chipset overclocks like a beast, you could easily overclock the processor to E6700 speeds, and beyond.
EDIT: Dirtie beat me to it.
If you don't plan on OC'ing, than this is a terrific mobo. Even still, the E6600 as is will run superbly cool and is energy efficient. It blows an FX-60 out of the water easily with it's 1066 FSB.
As far as GPUs go, not a big fan of ATI, but I'm sure those cards are no slouches. And as far as the monitor(s) go, I have one 20" Wide Screen Dell that I absolutely love.
Now, if I can just get rid of my XPS 700...