keyclone works w/ 64bit vista, its what i run on.. umm im not familiar with the Intel Core 2 Extreme.. is that a Quad? cuz i have the Intel Core 2 Quad the one that costs around $300ish well anyways everything you got looks like about what i got or better.. i run 5 characters.. i cap the fps though at 50 on the main and 25 for the background windows.. although i could easily get 50++ on each, so I would say just try trial accounts and see if it works... as for switching to vista... its up to you, if its just for wow id say go ahead, if you are going to be using a lot of other programs also take more time to think it over cuz there are a lot of programs that arent compatible yet with the 64bit although i havent found many that arent..

well thats one 15 yr olds opinion :P

-matt