For range and field use- I would think one of these would fit your need quite well:
http://www.amazon.com/Bianchi-Comerc.../dp/B000AL9CTY
I must admit that I didn't realize these things had gotten so expensive. However, they do work well, and they are truly ambidextrious. Mine does a great job with not only 1911 and Beretta- but also my Browning Buck Mark and Sigs 225, 220- and my CZ75.