Welcome to the forum Hunter. First of all, do you want to buy a complete AR or building it? They are 2 different budgets, of course building it is much cheaper.. sometimes.
Since i assume you are buying a complete rifle with $1000. Go to slickguns.com, i seen some deals from retailers about the Colt and Sig Sauer for almost $1000. I don't know much about DPMS so i don't have any opinions about it. I'm sure some users here will recommend you building it or buying a separate lower and upper.
Please also check out BCM for the upper or PSA. PSA has deals on lower parts and Uppers almost once or twice a week.
Sorry if this is kinda confusing you.
Also check out a complete Troy's from Dick's, if i'm not mistaken the price is $1100.
Be prepared that you will maybe spend up to $1300-1500, for optic, light, laser and etc. Just saying..