If I'm carrying a pack then lik Russ I go with the cress draw, but if I'm with out a pack I like my tankers rig (a Leather US M7). I also have a holster attached to the frame of my alice pack, between the pack and and my back where not concealed but still out of casual view. All three ways are comfortable and easy to get to.
_________________________
Depend on yourself, help those who are not able, and teach those that are.