Depends a bit on the competition you want to get into. I use a Double Alpha belt, a dropped and offset holster hanger from Ben Stoeger, and a Comp Tac holster for my STI. For night matches I have the exact same setup, except that I have a holster that Steve made me that accommodates my Glock 17 with a TLR-1. I think I like Steve's holster better than the Com Tac.
For belts, it is really hard to beat the Black Scorpions for the price.
Steve has made two holsters for me and I think he does excellent work. In fact, for the Glock holster, he used two layers of .08 kydex instead of .06, which is what a lot of other holster makers use.
Just remembered: he made a fuzzy holster mag holder for my buddy's G43. I got to play with it a bit. The mag actually clicks in the mag holder. Pretty nifty.
Oh, and I also had Steve make another rig for my other buddy. I got a whole setup for him for his birthday so he could shoot ZSA matches with us.