So I've got a tasco that's really not the right scope for me. I dont know whos good manufacturer wise and who to steer clear from. I've seen a couple BSA Scopes on sierra trading post that are pretty cheap...but I've never heard of them. Then there's Nikon and Leupold but I want to pay for quality not a name. Also, if I tried to sell my scope (Tasco world class 3.5-12x50) how much could I get?