I am planning on buy a Viper just deciding between on whether it's worth spending the extra money for the 50mm. The scope is going to go on an AR varmit rifle and will shoot no more than 500yds. I know the light gathering will be better with the 50mm and the resale would be higher but so would the initial cost. Any other advantages to buying the bigger objective with everything else being the same between the 2 Vipers?