I think your current setup has more than enough power to run WoW X 4/5. Many people use laptops to multibox.

I am not sure SLI works that well with WoW. I only read this in passing on forums, don't have much else to back this up atm. Or do you need this for 4 monitors, I honestly don't know as I never ran more than 1 monitor from a computer.

Personally, I would save some money and go with a Q6600. It's all about cash availability here though.

Is there a reason to go with the 667 vs 800 DDR2?

I'd go for 2xSeagate Barracudas 320GB (http://www.tomshardware.com/charts/3...mance,658.html)

I bought a G11 over the G15, the LCD panel I don't think is worth the extra money. Again, personal choice here.