Von Schweikert VR-4.5 amp recommendations?

I'm currently using a DJH AE-3 preamp with a VTL ST-85 amp, bi-wired to the VS spkrs. Looking for more speed and cleaner bass and mid-bass. VTL amp in this set-up is a little too loose. Thinking about going solid state, maybe McCormack, Mark Levinson, Threshold S300, Ayre V-3, Spectron Musician II, CIA, Classe, Nak PA5. Even though these speakers have good efficiency they seem to require a lot of power to come alive. I would guess high damping to be a priority. My price range is up to $1,800 max, but would prefer staying around $1,500. Used is ok. What have you tried or heard?