Very few boards have built in wireless. Only a few ASUS ones. And the boards usually have a hefty price premium. As their more of an OCers board.
However I once tried finding specs on the built in wireless to see what encryption standards and such it supported and was unable to find anything at all about it. When a manufacturer doesn't publish any info on their product it worries me...
I'd say to just buy a pci wireless card and use it, if your not going to use SLI or OC much no point in buying an overly expensive board.