I'm waiting to pick up my Sport and need advice on the optics. I will be using it mostly as a target/range gun and some varminting. Maximum range will be sub 300m. The price is as close to $200 as I can keep it. The Bushnell Trophy Xlt 3-9x40 looks to be about what I'm after. I'm not after top of the line, just good value. Also what kind of mounting rings are needed? '