Black Alessi CQC-I for Glock 19. Excellent fit and finish, slimline. Belt loops for 1 & 1/4 inch belt. I ordered it simply because I wanted to have a bespoke holster, and I consider it well worth the money and the wait. ( 5 months in my case as I am on the other side of the planet.)
I don't mind the Galco Royal Guard I have for my Glock 17 either, but it is considerably thicker around the holster mouth, due to the sewn in steel retention clip, the belt loops are one size fits nothing 1 & 3/4 inch, so the angle of the gun can shift, and the finish is natural horsehide, so the loops stand out against a black belt. Note I am quite happy with the RG, the Alessi is simply better.
other stuff in my BOH includes Galco pocket holster for a Tomcat ( thumbs down), Bladetech UCH for J frame (thumbs up) Helweg LTD speed holster for glocks (thumbs up) uncle mikes shoulder holster for ruger MKII (value for money) UM belt slide for 1911 ( you get what you pay for) leather Bianchi thumb break OWB for glocks 19,17 ( reasonable) and a few others.
Radagast