I need a new scope for the varmint rifle as some may have read. The Vortex and Nikon is what i have been looking for. Now its between the 6.5-20x44mm with Vortex and the Nikon 5-20x44 with the Nikon. Which would you prefer to own? I live in canada and im having a hard time getting my hands on the Vortex. Now if we go with Nikon would the 5-20x44 or the 4-16x42 be a better scope for varmint hunting, plinking, small game and target out to 500-600 yards?