Re: I have made a terrible mistake.
I hear what you say about the expense of good mags for your rifle, but you DO have a great rifle to start with. Thirty-odd bucks each for a factory mag is pricey, but buy 5 or 6 over time and you should be set for life with a great rifle and dependable mags.
On the other hand, buy a cheaper rifle (that you can find cheap mags for) and you've got a cheap rifle for life. Or until you dump it and buy the one you really want.....
I've never worn out a mag.