I recommend you checking out a Hub by Devon S. He has an excellent Hub on Sennheisers RS 140 Wireless Headphones. Devon, also has experienced hearing loss in one of his ears and has had great success with the RS 140s.
I don't see why you couldn't still use a hearing aid with these headphones. They are designed to fit comfortably over each ear.
However, the best feature about the RS 140s is the ability to adjust the volume separately in each ear. So it would be up to you if you wanted to wear a hearing aid or not..
Here's Devons Hub: http://hubpages.com/technology/Sennheiser-RS-140
Hope this helps.......................