Wilson 47D, Tripp Cobra, CMC and Check Mate. Chip McCormick is now owned by Wilson Combat but the magazines remain in the line up there. Check Mate is also very good and is the OEM supplier for several companies like Dan Wesson and Ed Brown. And Ed Brown has a magazine swap program where you can trade your old beater mags in to them and for $10 + shipping they'll send you a one on one exchange for a new Ed Brown magazine. I have nine old beater mags ready to send them right now. The Check Mate 8 rounders run my Dan Wesson just fine.
I like the cheaper Chip McCormich's right now. They are running good in all of my 1911's. Wolff springs make an extra power replacement for them and I replace the factory ones at six months then change the wolfs every 6 months if used hard.
You're all right about .45 magazines, but the OP was asking about 9mm magazines............
