One can "still" literally build a complete AR with some goodies like free float handguards, decent adj. stock, and a reliable upper for $600-$800 easily...With some upgraded options.
A lower from DPMS, Stag, Del-Ton, a DPMS or Bushmaster lower pts kit. your less than $200 so far. For a complete lower.
(Remember, you can always upgrade later) "Hopefully"...

Decent complete uppers from Rock River, Palmetto State Armory (.com) (many others)....$300 and up depending on bells and whistles....
Bravo Company (.com), Brownells and countless others have "deals", even on AR-15 (.com)....Parts/Dealer section, has blowouts.
Competition is pretty fierce to move products right now.
I'd go with a flat-top, flat fwd gas block, free float handguard, BUIS from A.R.M.S series 71. and a Falcon ERGO grip ($18)..and a adj. stock of your choosing.
I chose the VLTOR SOPMOD, but there are many. Shop around, assembling one is way easier than I first thought.
It's like Barbie for guys,...plenty of options and prices to get a reliable "basic" AR that you can upgrade.
For the price of a DPMS Sportical or Olympic model, you can build a semi-custom for the same price or even less.
Just my .02