I don't know the answer to this, but you may want to supply more details.
Are you looking for a 5.1 setup, a 6.1 setup, a 7.1 setup? Do you need ALL the speakers to be wireless? Just the rear surrounds? Do you want one of those HTIB type kits where it comes with a low end tuner that has the transmitter, then the speakers all have recievers and only need to be plugged into the wall???
Or are you talking about "wireless" as in, literally, not even a power cable, aka .. battery powered ??? because I don't think there is such a thing as a good wireless speaker that runs off of batteries...