Brian,
I've tried them all, open-finger, closed finger, high-dollar Sauer mitt, cheap mitt, mitt over a glove....all of them, and have settled on an open-finger Champion's Choice glove with the black "pebbly" grip. It's cheaper than the Anschutz's and even the Creedmoor, but is better built in my opinion.
Unlike Rost, I DO handle pencils, sling adjustments, everything, with my support hand quite often. You couldn't put me in a full-fingered glove for anything!