I've been using a Simmons Pro Hunter 6x18x40something on one of my ARs for a while...I've shot a number of 1/2" groups with that rifle. I've never had any problem with it fogging up, loosing zero, or anything. I think that one was under $100. As a matter of fact, I *think* that scope is now on my Model 12FV in .223. (I change stuff around so much, I can't remember who's on first lol.)
I would definitely rank Simmons above Tasco and BSA in quality...I'd love to get one of the Aetecs to try out when I have a few more $$. Anyway, good luck...I'm always juggling optics for as many rifles as I have, vs quality. I'd get 2 or 3 more Grand Slams if I could afford them, trust me.
For $126, though, you might have to take a shot at it...I'm pretty sure Millet will be a few rungs higher on the optics evolutionary ladder than Simmons, although if you read the user input regarding the Aetecs, a lot of people are mentioning them in the same sentence as Leupold.
Midway has pretty good prices on the Bushnell Elite 3200s...I think they have a 3x9 Mil Dot one for $179 dealer price...hat might be another one to consider.