I used the Senn 650's for a year - great cans but fell victim to a malicious toddler attack.
Tried the AKG 702's but proved too uncomfortable for me. Beyers I like, got some custom made 880's but found them a little fatiguing in the long run.
Have now settled for some heavily modded Denon AHD 2000 - absolutely love them and with a 25 ohm impedance, some of the most versatile cans around.
Great pairing, IMO, with the bushmaster.
I have a pair of Russian wooden delights, the Fischer Audio FA 011 for "open back" duties which, for 120 bucks, are ridiculously good.
When funds and the grim reaper (aka Greek taxman) allow, might be getting myself the Audio Technica 1000 RPM's or 2000 series open back headphones. Marvelous little things.
The bushmaster could drive any headphones and with consummate ease.

