I agree with above posters on the X48-DS4 and 600W+ PSU. For PSU for 4870 CrossFire I recommend PC Power & Cooling 750 or Corsair 750TX or better. For RAM go with good quality (ie Corsair, G.Skill, Patriot,etc) DDR2 800 2*2GB RAM.
Looking at X48 there are a few variation ranging in price from $200 range all the wayto $400!
I know the more expensive one has more features .. but is it worth it? Or a simpler version will do?
Also looking at 4870 cards, a few are coming out with different vairations: The Diamond OC Black Edition and Color with 1 gig RAM.
Do you think there will be a huge difference between these or should I go with the Factory standard one?
Worth it only if you want/need those features. Creative is still having driver problems with Vista last i heard, you might check out the Asus Xonar cards....or better yet use onboard sound for awhile and see if it does what you want, add a sound card later if it needs it.
Thanks for your response. Is the problem with sound card drivers related only to Vista?
I will be using windows xp. Would the ASUS x48 + Creative Sound Blaster X-Fi XtremeGamer + Windows XP have conflict ?