I'm looking to upgrade my Viper 4-12x40 on my SPS-T. I would like some sort of mildot or ranging reticle. I thought about the IOR 3.5-10 and the Mark 4 3.5-10 I really like the IOR reticle. What are the recommended scopes? I have never had a scope over $450, so I'm new to the real scopes. I...