azs, go to a major motherboard mfg site, like Gigabyte or Asus. Then choose the processor/socket you're planning on and review the various boards they offer. Compare what features those boards have and what appeals to you. Narrow it down to a couple of boards, then do the same with the other site.
Then go to a major reseller site, like NewEgg, and look up those boards to get prices. And look at the other board mfgs to see what they have similar to the others.