Until P-Mags came around , I wouldn't consider poly mags , after what I went thru with Orelites.
As for aluminum mags , stick with good USGI (Colt , Okay Ind) or new production Brownells.
As for steel , I've seen very few steel M-16 mags that weren't junk. The Brits Radway Green made some that were considered the best. HK made some too. Supposedly the ones made by the Singapore military were good too.