Wifi im not sure about. I believe the RKE was going to, or it does.. Ill have to look that up. And I remember reading about the new Neptune Apex controllers (Just released). Im pretty sure they are wifi, but dont quote me on that either. Anything with a ethernet port could be made to be wireless, just as you said.
The chart on this page should be able to help you out with your decision. The first two charts are a comparison of skimmers, the others are for controllers. The excel chart lays it out nicely.
http://www.aquariumcontrollers.com/a...omparisons.php