MULTIPLE ARM TURNTABLE

In addition to the Manley, the Aesthetix Rhea and the Audio Research Ref Phono 3 have 3 and two phono inputs respectively.

There are also some phno preamps with MM and MC phono inputs.

I own the Manley v2.0 and like it a lot.  I use it to drive a pair of Beveridge 2SW speakers via the built-in direct-drive Beveridge amplifiers.  You'll need no separate linestage, unless you want multiple high level inputs.  The Steelhead only has one high level input.

If you have a big budget, and if you are OK with solid state, you might consider the DSA phono2.  It has three totally discrete phono sections on one chassis.  Offers a choice of fully balanced or SE inputs and outputs. (Otherwise, only Atma-sphere offers balanced phono inputs, so far as I know.) You can set gain, load, capacitance, etc, independently for each one of the three sections.  It's built like a tank, would cost 3X as much if it fell into greedy hands of a marketer.  Purely for versatility and flexibility, there's nothing better that I know about, if you like SS.  

lean,

My Steelhead is original. Are you aware of any updates other than motorized volume?

Lewn,

Damn spell check.

Doshi Alaap full function pre or separate phono stage typically has 3 phono inputs which can be ordered in any combination of MM and MC, with switchable loading (3 values) for the MC stages.  In a head to head on a very revealing system, 4 out of 4 A'goners preferred it to the Steelhead, which is no slouch, by any means.