From your options, I take it you prefer SFP over FFP? Personally, for varmint hunting I prefer FFP tree reticles so I can use the reticle for drop and wind holds at any magnification (I'm usually using 22LR for ground squirrels, so holds actually matter). Varmints rarely give you time to spin turrets or roll the zoom. For the roughly $1200 price of the NF SHV 5-20 SFP, you have a ton of other options in SFP or FFP. What kind of varmints?