For outside the waistband holsters, I've always had really good luck with Blade Tech. I don't have one for the Glock yet. When I asked Steve F. about holsters for Marie, he reccomended "G Code" brand with the drop and offset.
I really like the Milt Sparks VM 2 for an IWB holster. Once again though, I don't have one for the Glock yet. I have used them with CZ-75, BHP, and HK P7 and they've all worked well. I also have a Galco IWB for my Sig 239 that works pretty well.
NRA & SigArms Academy certified instructor
Graduate, LFI-1 & LFI-2
CCW classes and private instruction in the Metro Detroit and Lansing areas