With all the talk about the Millennia HV series (which i love), i didn't see any mention of the Millennia STT-1 Origin. I've owned an Origin for a couple of years and i wind up using it on almost everything. For those who don't know, it's a channel strip combining a mic pre, 4-band EQ, and comp/limiter/de-esser.
What's unique about it is its "Twin Topology" architecture, which lets you select tube/SS signal path for the pre, and separately for the EQ & comp, and the fact that it incorporates both the HV-3 solid state pre and the M-2b tube pre, both of which are very fine, IMHO. And the presence of a very fine tube/SS EQ and remarkably transparent compressor (when used judiciously) are a BIG plus to enable minor adjustments going to tape/DAW that can prevent the need for plug-ins/outboard processing later.
Most of my experience with the Origin is with Neumann, B.L.U.E. and Schoeps mics, all of which sound great with it.
The only feature it lacks that i wish it had is an impedance selector. If you're using mics with unusual impedances, you may (or may not) find a subtle mismatch. That said, i personally haven't really found it to be much of an issue; my M 149s and Dragonfly Deluxes are rated at 50 ohm (instead of the standard 150), but they still sound amazing with the Origin. [Oh, i also wish it had an input pad; the exceptionally hot output of the M 149 occasionally overdrives the Origin when tracking very loud drums.]
Otherwise, i can only rave about it. For someone looking for an extremely *versatile* mic pre (with or without the EQ and comp features) that can cover a lot of ground without ever sounding bad (and almost always sound great), the Origin is well worth considering.