I am researching my next scope and have been looking at the Discovery line up. I am wondering what (if any) differences there are between the VT-T series and the HD series. I am open to other recommendations. Here are some of the features that I want: approx $300 price point, first focal plane preferred (but not an absolute must have), good turrets for dialing, 18 to 25X magnification, and of course CLARITY is king. This scope will be mounted on a BSA R10 - replacing a Hawke Vantage 4-16. I also have an Athlon Argos 6-24 BTR for possible comparisons.