Another option is the Musical Surroundings Phonomena Nova. The Nova sells for $1K new, had dip switches for resistance, capacitance, and gain. Also runs off batteries that recharge via the AC plug.
I like mine a lot, but just don't have a lot of experience listening to other units in my rig so I can't comment on comparisons to other units.
I like mine a lot, but just don't have a lot of experience listening to other units in my rig so I can't comment on comparisons to other units.