SWFA in 10x or 12x (assuming you meant 100-300 yards, and not "feet")...
http://swfa.com/SWFA-SS-12x42-Tactic...pe-P53714.aspx
with matching rings, or a set of Leupold PRW's
http://swfa.com/Aluminum-30mm-C3056.aspx
No real need for a more expensive variable for your application of target at known ranges. You can get more bang for your buck "quality wise" with a fixed, than variable.