I have a Gitane D-500 which I like a lot. I recently installed a K&K pure archtop pickup in it and am less than thrilled with the sound. It sounds very "hard" and there's no high-end "string sound". It's frankly only a barely usable sound through my PRRI with the treble turned all the way off and only a little better through an expensive Schertler Unico (I don't own, but I tested it out at Pioneer Music in Portland.)
I have a Fishman Rare Earth in a Larivee flattop that I like a lot, especially through my PRRI. While it's by no means a "pure" acoustic sound, it's a very good sound. The oversized soundhole on the D-500 obviously won't fit the Fishman without a lot of monkey business which I'd really rather not go through if I don't have too.
A pair of teeny tiny magnetic pickups have caught my eye and I'd like to know if anyone has experimented with these on a gypsy guitar:
Lace Acoustic Blade