Sorry, that's just me being a grumpy old b@stard (;
I like AMD, but rignt now intel is definately better bang for buck, if i was you i'd look into a p35 or X38 board with an E8X00 chip if you're looking for Crossfire
P.S. if you can hold off for a month or so AMD are brining out their HD48X0 cards at the end of this month, or beginning of next month, and the rumor mill is saying that they are going to blow everything else out the water.
I saw the two PCI-E "long" slots on that board and was wondering why they didn't say 2 x16 ports. I guess that's why. Are you sure it actually supports crossfire? An x4 slot would reduce performance a bit. x8 is great and x16 is a little overkill (for now), but x4 is a little low.
I only see Hybrid CrossfireX (or whatever it's called) which is Crossfire with the onboard. Also from what I've heard, you probably want to wait for the SB750 for RAID. It will replace the SB600 on their good true Crossfire boards in a month or so.
By the way, wait for the HD4xxx series, just in case is really worth it.
Atm, i would really wait one month or so. Even that isnt much worth it the price for a 3870 should go down a bit more. I know its always something new coming soon and all, but there are too many GT200 and HD4xxx details running around to buy NOW. One month i said Remember Moore Law !!