What preamp would work well with an Odyssey Strato

With a budget of $200 and a line source, I would suggest you opt for a volume cotrol rather than an active pre. People like goldpoints offer such products and you can contact them (or Odyssey) for the right ohm rating for yr amp.

Cheers

Andy, passives DO have an ohm rating. A transformer volume control has a STEADY ohm rating in & of itself. Volume pots have a rating that may vary with frequency. Usually one checks impedance at a reference 1kHz frequency.

However, all that needs to happen is that:
*the source (i.e. yr Denon at moment) outputs enough energy to drive the "passive"; check its output impedance (the lower the better).
*the power amp's input impedance is high enough to be driven "passively" (to put it simply, 10k or more)

Armed with this info, give the passive's supplier a call.

Case in point:
my cdp has a 22-30 ohm output impedance across its frequency range (22 ohm reference).
My amps have 10kOhm & 33kOhm. BTW, one of my amps is a Symphonic Line Kraft -- S-Line being the design Odyssey uses for its amps. I use a 10k rated TRANNY volume control with excellent results.
Before that I used a 100k and 250k volume pot: the 250 sounded better: amazing, but there it is!
Cheers