what are some good crossfire motherboard?

Your best bet is to go with an Intel chipset. Any mother board with the P45, x38, x48 will be a great choice. Asus makes awesome boards and the one recommended has tons of feature for that price.
 
I just finished a build with an ASUS Rampage Formula, (great board), and just ordered a P5Q Pro to build for my Wife's work. Looking foward to another ASUS build. Be sure to check the approved vendors list when choosing RAM though. :)
 
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