Avoid the Tier 1 vs Tier 2 rifle discussions, its painful. The 800$ AR will be just fine for your purposes. Look for a RRA, Bushy, CMMG, Stag, LMT, etc... M4 and be done with it. That should be 800-900, make sure you get an iron sight (probably a troy or arms #40 vs the carry handle). Use the extra 100-200$ and buy mags. I prefer USGI spec mags , lots of folks are going crazy over pmags these days. Either are fine. Don't pay more than $10 a mag. For ammo, hit Kames every now and then. They've had the best prices I've found on XM193 spec ammo when they've had it on sale.