Out of those listed Shane, DMRII gets my vote. It's compact, great turrets, illumination, integrated throw lever, great reticle, the glass is good. Really there is little to dislike about the DMR II. The current Gen ERS/XRS can be had for a good bit cheaper on the classfields than the other scopes mentioned. Steiner i'd stray very far away from as i just can't seem to find anything positive about the T5Xi and wouldn't be willing find out the hard way either.
Gen I Razor i have no experience with, if it's glass is anything like their razor binoculars it's got to be really good. I do dislike the 35mm rings.
Mark 6 i've owned and the glass is good, not great, but more problematic is their reputation for not tracking. Which mine also exhibited. The eye box is the worse i've used on any scope to date at the top end of the mag range. It's downright terribly sensitive. Scope should've been restricted at 15x with that kind of exit pupil. M5B2 turrets are pretty sloppy as well, they're usable but sloppy.
If you can wait i think the Gen II PST might be worth checking out, if not i say grab a DMR II and don't look back.