Re: Differenc between Leup. TMR and Mildot
For years, Premier Reticles modified Leupold scopes for FFP Gen II reticles. They are excellent scopes - I have three of them - and the Gen II reticle, with a hashmark halfway beteen the dots, is an excellent reticle, chosen by the Marine Corps. Their drawback compared to more recent scopes is they are only available with MOA knobs, M1 knobs for the higher magnifications, and M3 for the 3.5-10X40.
When available on the used market, they are generally priced in the vicinity of $1100-$1000 dollars for the 6.5-20X50M1, or a bit less for the 4.5-14X50M1. There was recently one for sale on this site for around that.
You'll have to keep an eye out, though, as they generally get snapped up pretty quickly.