Best Amp under 5k to power Dali Euphonia MS-4?

What would be a good used AMP to get for the Dali Euphonia MS-4 Speakers? (Under 5k) Primarily looking for Class A & maybe Tube.

Power is a consideration for speakers: 350 watts / 4 ohms; sensitivity is 88; 4 impedance ; 33- 28,000 freq.
Pass X250.5. I used this with both MS4 and MS5
Both the MS4 and MS5 sounded great at a friend's with VTL tube mono blocks