I bought my Gentex last year from here:-
Flight Helmets - Flight Suits - Aviation Helmets
AKA Government Sales Inc
Very good service, a good choice of colours and very helpful.
They made all the shipping arrangements - all I had to do was pay the VAT and duty. The cost was $1,080 including bag, two visors, CEP kit and shipping, but not including VAT and Duty - can't remember how much that was. The total was less than £1,000 though
The CEP wires are very thin and do not have any effect on the earcup seal.