I have a Nightforce 3.5-15 x 50 on my 7.62 AR and love the clarity. Can't go wrong and its at your price point with the mount.
I have heard really great things about the bushnell with the Horus reticle. It might be a scope to consider on my next 7.62 rifle.
Magpul or Troy sights are great. I have them both and work great. Magpul is more cost friendly.
Larue uppers are great too. But be prepared to wait a LONG time. They are on a massive backorder on uppers and complete rifles. I don't think they even know when they will have any uppers in...