MidWay Usa had the Chip McCormick power mags on sale like a month ago, Best Mags in the market if you ask me, had never failed on me on any of my 1911's and they make them on 8 and 10 rounders, top quality. STAY AWAY from chinesse mags on ebay i made the mistake of buying some 10 rounders and they jammed on the first try. www.midwayusa.com you are looking at spending about $27.00 per mag but like I said best in the market, they have cheaper versions on the McCormick line as well.
If you're patient, midwayusa.com often has Wilson Combat (8) rounders on sale for less than $30 ea. If you don't like those, I've had good luck with Colt/Springfield (7) rounders for less than $20 and sometimes on sale for less than $10.
My PT 1911 runs flawlessley with everything I have put in it. The PSI ACT mags look like what it came with, and I bought a bunch of them from Brownells. They are inexpensive. All of the big name gunsmiths have come out with mags that look just like them, and I am guessing that they are all probably made with the same tube. The only downside is that they do not come in Stainless steel from PSI (at this time). I bought a bunch of Wilson #47's and they run great, and are usually what I have carried and shot in matches.
I know a lot of people like the McCormick's, but 2 of the 3 I had don't work worth a flip. they are the only mags I have had malfunction in my Kimbers. Problems with the followers. I got away from the welded floorplate mags for the removable floorplate mags for ease of cleaning.