If you want to go top-of-the-line, you could go with the Bose Link AR1 or AL8 systems.
If not, you could check at your local Best Buy (or other) for a receiver with built-in wireless. They will help you find what you are looking for there.
Or, if you want just a very simple way to do things, the Griffin technologys’ Evolve speakers have an input that you could use to hook up properly to a non-wireless system. The good thing about these is that they do not have even a power cord running from them. The bad thing is that you would have to take them down and lay them on the charger every night (or something like that).
I hope this helps a little for now, I’m sure later there will be more extensive posts.