Depends on your budget, but for me, I am looking at a TR21-R (1-4x) on a Larue SPR-EE mount for my next optic. I am on a limited budget so it won't be for a while (just sold my Eotech to pay some surprise bills), but 1-4x in a scope with BAC meets the versatility balance I need since I can only afford a single scope for the AR.
I wish it had a different reticle (I sent Trijicon my idea) as I want something with holdover and windage marks but until that happens, the TR21-R meets the mark (unless money falls from the sky, then a Schmidt und Bender Short-Dot might happen).
Edit:
I removed a referral to another dealer because TalonArms is working to earn your business here by making a solid recommendation, and they have a good reputation on the EE.
TalonArms is suggesting the same scope I am. If you haven't looked through one, do it. Bang for buck, it's an outstanding optic for close to intermediate ranges. Not as fast as a dot or Eotech for CQB, but goes out to longer ranges without adding a lot of weight.
The new Elcan would be good too (1x and 4x), but I expect it to be more expensive than your budget.
An advantage to both these scopes is that if you have astigmatism like I do, they shouldn't bloom or smudge (best description I can give it). For me the Aimpoints and Eotechs tend to get fuzzy even with contacts or glasses on, and without correction they get really bad. I can read without glasses but the astigmatism really affects those optics. I found the ACOGs, TR21-R, and the older Elcans not to have the same issue. I haven't tried the IOR or other scopes except to look through them, but I have now owned both Aimpoint and Eotech and my eyes weren't up to the task. They are all great optics, and I will probably buy another Eotech or Aimpoint someday despite the vision issues simply because of the NV capability.