My honest opinion? Wait just a little while longer, save up $200 more, and get yourself a nice NY-compliant Colt, BCM, Noveske, or LMT.
Yes, brands like these are a bit more expensive, and you probably don't care about milspec standards. But the level of quality means you will have less or no issues later on, as long as you do basic maintenance once a month or so. The trouble with DPMS, Bushmaster, RRA, CMMG, and other "budget rifle" manufacturers is that they cut corners in order to keep costs down and that leads to problems that develop in the gun over time. Parts made by those manufacturers may not be made to standards, meaning they may not "play" well with other parts in the rifle and cause wear and malfunctions that could be avoided using parts from a more reputable manufacturer. Now, this doesn't happen to ALL rifles made by these companies. Some of these AR 15's run just fine and never have problems. But why take the chance? If something breaks, you'll end up spending the money you could have used to get an AR with better fit and finish anyway, possibly more.
There's a valuable lesson I learned over the years from sending my firearms out for repairs: "Buy once, cry once."
Here's a quick reference list of features you should look for in any AR 15:
M4 Feed Ramp Barrel Extension (USGI)
USGI 1/7 Twist Rates
USGI 5.56x45 NATO Chamber
Chrome Lined Bore and Chamber
HPT (High Pressure Test) Barrels
MPI (Magnetic Particle Inspected) Barrel
