ThanksWhen you step up to the more expensive brands like BCM, Colt, LMT, DD, etc., you're getting a gun that is built to higher specs with better components so it will last you a lot longer with less problems - or at least it should.
As the others mentioned, DPMS is a good entry level AR, and it will serve you well at lower round counts. If you plan on shooting more rounds, taking training classes, etc., then a higher level gun would be a good investment - especially at the lower prices they are going for nowadays.