crossefire kinda sux if you plan on going higher than 60 hz on your monitor. Also, the max resolution is 1600 1200 so that kinda sux too. But if you got a nice little 17 in monitor like me, that's just fine.
Crossfire is kinda quirky to me. It's gonna be higher priced than SLI, and you will have to buy a special "master" card. But we'll have to see. my info may be wrong. i really hope so. Very much, as i currently hvae a x800xl.