I've been hesitant to respond to this thread because someone will invariably get their feelings hurt due to their own personal choice of AR. However, let's examine the statement quoted above. What exactly do you get for that extra $300?
The Colt offers the following over a DPMS:
Correct mil spec barrel steel
Correct gas port size
Correct 5.56 Nato chamber
Mil spec bolt carrier group - proper materials, assembly and testing
Mil spec 7075 receiver extension
Better quality lower parts kit
Proper assembly throughout
In some cases, the DPMS does not include an ejection port door
Those are just a few differences I can come up with off the top of my head. Price is not always an indication of quality, but there is usually a reason for something being very inexpensive compared to known good products. DPMS and many other manufacturers are building a gun to hit a price point. In order to do so, corners must be cut in materials cost, assembly methods, QC and testing.
Disclosure: I do not own a Colt or DPMS, as neither fit my personal wants / needs.
The answer to the OP's question lies in another question. "What makes a quality AR?", not who. Unfortunately, answering that question requires a lot more personal research. But in the end, the OP will be much better equipped to determine which products will sufficiently meet his needs and meet his budget requirements.
LOL, worst advice ever. No offense dude, but you obvious have an extremely limited scope of knowledge pertaining to AR's. It sounds like you may have purchased a DPMS and convinced yourself that anything higher quality and you are "just paying for the name"....hardly.
In addition to the above post add, correctly staked castle nut and gas key.
MPI tested bbl and bcg
Glad I'm not the only in here drinking the DPMS kool-aid...