Personaly I'd leave out the SLI and go for a 8800 with atleast 512 mb. 4 or 5 WoW's make better use of it then they would with 2 GC's, I'm pretty sure. And does it have 2gb in total or 4 ? You will need more more, atleast, I did..

Also, there are plenty of FAQ's 'n HOWTO's on this forum, I would suggest you compare your system to those posted..

Good luck