I have a Crossbreed Supertuck that is absolutely fantastic. Very comfortable with a Glock 21.
There are a number of companies that make this type of holster:
White hat holsters, Theis holsters and more. I know at least Crossbreed has a 2 week try-out period, return it if you don't like it. I believe some of the others have this as well.
If you google 'crossbreed type holsters' you'll hit the jackpot.