For all around use you really can't beat a variable. I like something in the 3-9 range, but don't eliminate a 2.5-10 or 3.5-10. Since you have $500 to spend there are a number of good scopes out there for you. The Leupold VXIII 3.5-10X40, Zeiss Conquest 3-9X40, Bushnell Elite 4200 2.5-10X40, & Nikon Monarch 3-9X40. These are all in your price range and I've listed them in the order in which I think they perform. I own all of these scopes and this is how I categorize them. I would say the Leupold & Zeiss are a toss up and I don't think one clearly outperforms the other. Also, they have the best eye relief.