The Sport is a pretty good AR but trust me it's not "on sale" at $750! People often have reported sales of $650 and under.
At the sub-$800 price point I'd recommend PSA. For the last year they've been the AR bang for the buck leader.
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
US Army 1966-69, VFW Life Member, Retired Geek