Hello and welcome. I haven't had a AIM scope and will admit to not seeing one in person, but I did a quick search and found that they are only about 50 bucks for a 3-9. You won't see anyone who is serious about long range hunting (and dialing in on a target) getting by with something that cheap.
With that said, the Nikon Buckmaster is a good buy, so is the Bushnell Elite 3200, or Tasco SuperSniper 10 and 16 power scopes. From what I've seen, these three are pretty good bang for the buck and are about the entry level optic to be able to dial in for shots rather than holding over.
My father and brother inlaw both use Nikon Prostaff scopes and they do hold their POI. I wouldn't trust them to dial range in continuously however. If you are going to simply use a hold over method (not as precise) you can get by with using a much cheaper scope. All ya need is one that will hold it's zero. You will want one that has multiple aiming points in the reticle so you don't have to just guess what 3 feet is at x number yards away. If you want to be able to shoot long distances and are limited on funds, your much better off getting a 3-9 that is clear and tracks well rather than buying a 4.5-16 that is dimn and unreliable. You don't "need" a high power scope to shoot long distances - but you need a good reliable aiming point.
Happy hunting, Britz
I used to re-load but now I "hand-load".
-- Well, at least I try