I've picked up 2 BCM RECCE Rifles this week, one 14.5" and a 16". Yes BCM is out of stock most of the time but with shipping I have $1250 in each rifle found them online. Colt, Spikes, PSA, Daniel Defense, BCM, Noveske, and S&W all make outstanding rifles among a few others. If you are starting out just getting your feet wet with an AR then maybe a BCM or DD isn't for everyone.
When this question comes from people who are new (depending on what their shooting) I try to start some where simple IE M&P Sport, Sig M400, Colt 6920. For the people who are going to shoot the crap out of an AR, go to courses with professional instruction I go a little higher IE your mid length Mil-specs. Not saying any other rifle won't get the job done but the extra insurance in quality parts and build never hurt anyone.
For your ave Joe who is only going to put maybe 550rds through their AR then yes a DPMS is going to be just fine.
My school of thought is to get a little more Rifle then what you need.