Thanks for the replies chaps, very interesting stuff.
I just spent 2 hours flying today in my trusty HM headset and felt like my head had been in a vice afterwards so comfort is a definite factor here.
From what I can gather then the DC's are the best bet, I reckon I'll just plump for the most expensive passive set I can afford in the DC range, probably the 20-10.
Test flights however, are not an option since I live in the baron wastes of Aberdeen where there is a distinct lack of aviation supplies. Anything I purchase will therefore have to be by mail order.
Never mind, at least the sun was shining today, briefly !
Regards
UA