Are the Leupold Mark IV scopes worth the extra $300 - $400 over the VX3. I am looking at the 4x-14x MKIV with the TMR vs the 4x-14x VX3 with the fine duplex. I know I can get knobs for the VX3 and still save a couple hundred bucks. Yes, I know I should buy a NF, but I can't get anywhere near...