Stock PARA's at 26 bucks for me. They've never failed!
I have a few Wilsons ETM but for the extra money, I don't see a difference in function. From a fabrication standpoint, they seem to be built a bit better and that's reflected in price at 36-38 bucks.
McCormicks, I've had some problems but they weren't mine and I don't know if they'd ever been cleaned before I used them. I'd give them a try for range mags.