Amp or Integrated for Dali MS4

I recently picked up a used pair of Dali MS4s. Prior to buying them, I had heard them in a couple of different dealer systems with tube amps where they sounded phenomenal--female vocals to die for and solid bass, among other things. Unfortunately, the amps (EAR 890 x 2 at one shop and an unknown but $20k amp at the other) are waaay out of my price range.

Now that I have them home, in my more modest system, they are really showing up the rest of my gear, i.e., not much synergy. I have a new apartment, so I've recently ordered some acoustic treatments to address the "room" part of the equation.

For those of you who have experience with the Dalis, what amp or integrated do you like the best? I'm looking to spend less than $5k on the used market.

The rest of my decidedly mid-fi system:
PS3 source
Onkyo TX-SR705 HT receiver
Musetex MTR-101 monoblock amps, updated in 1996

I generally don't listen at high volumes, but the 100WPC MTR-101s just seem to run out of steam.