PS Audio 250 Delta monos/improvement

In the process of downsizing my system (smaller space, shared space rather than separate room for the audio), I'm looking at everything except the preamp, as it's quite small already, and doesn't even require power cords.

At any rate, I have PS Audio 250 Delta monos, and am wondering if there is something for a sane price (sub-$4k) and smaller (stereo, even?) that will yield better sonics.

When I got these amps new, I dropped out of the market. I was done. I would still be done were I not wanting to make things smaller. Any suggestions would be much appreciated.

p.s. (No pun intended) Yes, I thought and still think that the 250 Deltas are brilliant, brilliant amplifiers.