Did some more digging, other than the Rocketfish unit I linked above and the Amphony units (which have had a lot of terrible reviews), seems like there is no solid solution.
The Amphony 1800 kit seems like an ideal solution, 80w per channel but there are literally horror stories on the reviews.
I really don't want to downgrade to a 3.1 system.
I guess the other option would be to sell my current setup and get the Bose Soundtouch 300 system with sub and wireless rears. Mind you, at nearly 2k (and I have to give up my denon reciever), not sure if its worth it.