Just throw in my opinion here...
I may have a lemon, but my Mueller 2-7 shotgun scope crapped out on me. I would not recommend Mueller. It's back in it's box right now sitting on top of my gun safe.
I had it on my H&R single shot bull barrel 12ga. slug gun for deer hunting here in IL and it worked decent for 2 years. This past season i took it out to sight in for deer season and couldn't figure out why my shots weren't hitting paper. Turns out that whenever I made adjustments with the zoom...going from say 2x up towards 7x, the fricken reticle was spinning inside the scope as i adjusted it!
All that to say, if i was doing a budget thing, I've had pretty good luck with Burris Fullfield II.
Redfield, Zeiss, etc. would work too as everyone is saying, but i've just never used them, so i can't comment on those.