If you like the 10mm I highly recommend DoubleTap Ammo for the best variety of the best 10mm loads out there.
Concur. Underwood and Buffalo Bore are also very good.
Full disclosure: I have a new Glock 20 that I'm still trying to work into a carry routine. The problem is finding a holster that fits me. With a gun that large inside-the-waistband is not really an option unless I want to buy my pants two sizes larger. :-(
Using Buffalo Bore currently, I’ve heard Double Tap is good but I’m looking at Underwood for my next purchase, prices are good and I’ve heard good things.