Rarely, the OLD, 3 box version of the Audio Physic Caldera comes up used. Phenomenal sound, imo. Within the last few months a pair was for sale on Audiogon for ABOUT 10,000. Audio Physic Avanti III's have been highly praised, but I've not heard them. Would try them out first with the Odyssey Stratos Extreme monoblock amps and Tempest Extreme preamp that I already own.