The Calypso Signature can be had for $7000 new. I just upgraded from a standard Calypso to the Sig. Possibly the single most enjoyable upgrade I have ever done...the Calypso bested my Pass Labs 0.2 and the Signature upped the bar to a another level. I would love to hear the much more expensive ARC Ref series and compare. Anyone in the N.CA. Bay area want to do a A/B?