I've also had luck with the Ramline mags - some folks don't like them but all 6 I've used work every time. The plastic seems vulnurable - but they were dirt cheap at $10 a piece.
I also hear that Thermold mags are great.
Ruger and PMI are the best - they work every time, look good, and they are sturdy.
Check out fourfourmag.com.
Have fun,
Joe