Acutally, I was also looking at the Trophy 4x-12x-40mm.
As the moderator of the Optics forum, I know quite a bit about centerfire rifle scopes, but little about air rifle scopes. I do know, however, that the two biggest distinctions is that air rifle scopes 1) have to endure both positive and negative forces, and 2) need to be parallax free from 10 feet to infinity.
I normally spend high dollars for scopes because, with scopes, you get what you pay for. I think that $150 is the minimun, and perhaps maximum, that I would want to spend - and still get good quality.
Have you used the Trophy? How was it's tracking?
Zachary