I've had two Brother printers (HL-2140 and DCP-7065DN) and they've both worked flawlessly with OS X. Lots of Brother printers do to such an extent that I've heard other people categorically recommend the brand for Macs. Of course, other vendors also support the Mac well. (I would recommend avoiding host-based printers because one that natively supports a standard printing language is much more likely to work regardless of vendor support for, say, future OSes, but that's just my 2 cents.)
Keep in mind that your printer does not actually have to support wireless networking for you to be able to print to it over your WiFi network. If you have an AirPort Extreme Base Station (or few other routers with similar print-serving capabilities), you can connect a USB printer to its USB port and effectively print wirelessly from any computer on your (wired or wireless) network. If you get a printer with an Ethernet connection, you don't even need a special router: just plug it in to your home network and you'll be good to go, again for any of your wired or wireless devices on the same network. If you have a spare computer or a server, you can even connect it to that and set it up as a shared printer. I mention these options only because lots of people seem to have bad luck with the wireless capability built in to many WiFI printers. My preference is the second option I mentioned, which is what the DCP-7065DN supports (the "N" in Dell, Brother, and probably a few other manufacturers' model numbers usually means "networked," as in Ethernet; a "W" may mean "wireless," but again, you don't necessarily need that).
Hope this helps. I don't have specific model recommendations besides ones I've used personally, but we also don't know anything about your desired feature set. You can always check Apple's list of printer drivers that they make available, but keep in mind that some manufacturers also have their own that they may not distribute through Apple (i.e., just because something isn't on here doesn't mean it's not supported):
http://support.apple.com/kb/HT3669