I went hawg-wild with the Ruger rotary mags. They've since come out with clear versions, but they all have the integral metal feed ramps.
The Butler Creek Steel Lips mags work pretty well, if you can find them.
I'm wondering why, if Bulgarian Waffle AK mags were so easy to produce and sell with molded-in steel bits in all the right places, why we can't do so with a polymer AR mag.