I would look at a Pass First Watt F7 or J2. Purest Class A amps out there. If you cross your Treo's over to the Swarm at 80 Hz, you really don't need much power - 25 to 50 watts will do pretty well.
The Quicksilvers are already pretty good, but if you want to stick with tubes the BAT and ARC amps work really well with Vandersteen's. For that matter so do the BAT solid state amps.
The Quicksilvers are already pretty good, but if you want to stick with tubes the BAT and ARC amps work really well with Vandersteen's. For that matter so do the BAT solid state amps.