I plan on buying a new rifle soon and after doing lots of reading online I want to get a Leupold 3-9x40 to go with it. Only thing is I know there are a few models with various prices. I dont know much as far as what features differentiate them and the price. What would be a good choice for a quality scope but not too spendy. (Would like to keep under 300ish but I dont mind paying more)