(have not found a mag carrier that I like).
+1. A good mag carrier has me stumped, too.
I have three holsters for my Glock 23: A safepacker, a Blackhawk SERPA paddle, and a Crossbreed supertuck.
Carry ammo is TAP or the Fiochi copy of TAP's.
Cover garments:
Duluth Trading sportcoat (it is a perfect mix of a sportcoat and an old Carhartt barncoat.)
Patagonia micropuff vest (the granola logo is great diversion).
Aloha shirt.