Atec CMM 4 works great for ordinary calibres. For magnum I'd go Maxim. I have a CTM 4 myself I think ???... and a Maxim Titanium.
Roedale should work as well as it is a direct copy of Atec (apparantly he was caught redhanded at IWA a couple of years ago - he had mixed in an Atec module in a mounted "Roedale researched moderator :D )
I cannot really comment on other moderator as I haven't used them much, but there is an abundance of good moderator tests in Scandinavian magazines (measured tests, not subjective). Hausken, S&L and that finnish brand I cannot remember the name of all scores well but no moderator does it all (min weight & max moderation) but there certainly is HUGE differences in the effectiveness.