If you can squeeze together $210 plus shipping then I'd go for the
Nikon Team Primos 3-9x40. It's a private label Nikon Monarch UCC (a 4-Star scope on the Hawks scale) - a very good scope optically equal to many $350 scopes. I own two of these and recommend them highly.
If you can't afford $210 then I'd look at the
Weaver Classic V9 3-9x38 for $150. Again a very good scope, not in the same league as the Team Primos but it's a pretty darn good scope. This would be my second choice among these. I own several V-Series Weavers and like them a lot.
If you'd rather have a fixed power then the
Weaver K6 6x38 can be had for $130, or a
K4 4x38 for $135. I own a 4x38 and it's a good scope.
Here is how they compare on the
scope food chain...
Edit: Here's an article that may help you understand what you need.
Scope Magnification and Rifle Caliber