It is hard to beat Magpul Pmags, as stated above, in quality, performance, and/or price....And they come in several difference colors!!!! There is a 3rd generation of them coming out soon. However I have several 1st and 2nd generation, and have not had any issues with them at all.
I had some old mil spec mags that I was using. But after doing a lot of reading on here about the p-mags I decided to get a couple. Needless to say the mil specs are rusting away in the closet (not really). P-Mags are the way to go they feed great for me and are a lot quieter than the steel mags are.
I recently purchased some Thermold 10 round mags to convert to 5 rounders for Michigan compliance. I have put several hundred rounds through these and they have worked perfect. At 6.99 a piece you cant go wrong. My other mags are P-mags.