Speakers to replace Martin logan Prodigys

Hey

Sucks you don't have the room for the 'stats

For a smaller space, you're good to want to look into a good pair of monitors. For $5 - $7k you can get some of the best.
Some good choices would be:
* Dynaudio C1
* Sonus Faber Electa Amator (1 or 2)
* Verity Parsifal monitors
* micro utopias

You're going to miss the prodigys bass with one of these... but pick up a used rel strata 3 for $700 or something and you will be in business

The no preamp thing is more of a source/amp impedance thing... so if it worked for the Prodigys, it will work for another speaker.

Just make sure the amp is efficient (and has enough current) for the new speaker. The wolcotts are powerful and will be fine for any monitor that I know of.