Bose X
The auction finished 20 minutes ago as I write this, so I hope you got them!
I've used a/c powered Bose for many years (with the lemo plug) and have a battery powered 'spare' set (with the u174 plug) for flying other machines. I rate the bose very highly, but (i) the lemo plugs are quite fragile and a careless pax can easily rip it out from the socket, damaging both and (ii) I've also heard the mics go on the bose after a couple of years although I've never had any problems. As for listening to MP3s, there's nothing wrong with this as far as I'm concerned! Obviously not in busy airspace, but its no worse than driving a car with the radio on <waits for flame>.