I have a need for wireless headphones and have read some of the past comments advising wired over wireless. But for my current need, wireless is the call. Have been reading about Sony MDR-RF945 or RF975 Advent AW 770 Senheiser RS60 or RS80 Need to keep price <$250 I am a long ways from anywhere to listen to headphones, so will have to do my best and then run with it. Have good cord headphones for quality listening, but what are recommendations from the above...