Mini 14 is a great rifle.
just throw a muzzle break, bed the stock, do a trigger job on it. You'll throw 2 inch groups on paper at 100 yards, plenty accurate enough and you can do all that well under $100.
For high cap magazines, buy PMI, Ruger LEOs or Masen/BlackWarrior mags. Those are all very reliable mags and you shouldn't have any problems.
Don't badmouth the mini 14 till you try this combination. You'll be happy! You want any more info, or have any questions on the mini 14, shoot me an email.