Hi!
I've been down this road and still haven't made my mind up! The ones I've tried thus far are the HMEC 45 as you have. Thought they were good as are light and it's designed to fly with one ear off, if you need to. I did find quite a bit of white noise with them though. Wondered whether the HMEC 25's would be any better with their small padded ear piece, not cheap though, £495ish. The only other ones I've tried are the Pilot 17-79 from Transair. Stunningly quiet as you'd expect with full on ear pieces they also have a neat trick that the battery is housed in the headset so you can disconnect the lead at the headset and use them outside with the ANR still working! Crushed my skull with the headband though! i think the HMEC 25's aer the best compromise.
Good luck,
Wander
