On Gossamer is the only brand of bra I wear -- I don't have a particularly difficult size, just a 32B, but I find them so comfortable I don't see any reason to stray. The Bump-Ups give me a nice, well, bump up. My only is that were made a little better -- i tend to wear 'em out after 6-12 months or so (though i only rotate between 3, so i get a LOT of use of those 6+ months).
On Gossamer Women's Mesh Bump It Up Bra