Both are great speakers, and of course would match beautifully with your amplifier. Because of your amplifier I think both speakers would be a better match then the monitors.
The Model 50 is slightly, and I mean slightly, warmer overall then the Perfect Set. The Perfect Set is slightly, and I mean slightly, more transparent, therefore you can pick-up some of the micro-details more easily. Both have excellent bass, but the Perfect Set will go somewhat deeper because of its 12 inch woofer.
Two ways to try to describe the differences: 1) Would you rather sit 15 to 20 feet away from the stage/ Model 50 or sit about 5 to 10 feet from the stage/ Perfect Set when you go to hear live music in a jazz club. 2) Do you love Telefunken or Bugle buy NOS tubes. They are both great, but sound different.
Finally, both are good looking speakers, however, the Perfect Set is a much wider/deeper speaker then the Model 50, so you would have to decide which would look better in your smaller room.