I dont think bluetooth is a problem with BB... as I stated before my Motorola HT820 headset works flawlessly and I also use them in my car with a Sony MEX-BT2500...
The car reciever sounds better... I can compare sound quality almost to aux cable... (and is great to have full stereo sound
)
On the other hands I have had a short pause of the music maybe due to radio and other signal interferences.... But the motorola handles this better... It have never drop the music playback within range (if no walls or people in between +10 meters / +33 feets)
So Im guessing your problem its the bt headphones... try the sony's you wrote down... or the altec lansing backbeat if you can afford....
Also the battery on my headphones last days! seriously the battery is waaay long... unlike the one in the BB Flip... which I charge every day and sometimes more than once a day.... (but I do use it a lot for music playback with bt)