Since posting ive gone with the Telex 850 airman. Thought the fact that its battery free would be a bonus. I purchased it from the States $414 so even with the stronger $ it still saves me about £80. Luckily I got a mate living there & returning to the UK in 2 weeks, so he can bring it back!
Thanks for all the useful suggestions though
, looking forward to a quieter B737 flight deck!!