Aesthetix Collisto Signature or SLP 05 Preamp?

I owned a Calypso and now have an SLP05. I don't know how the Callisto compares with the Calypso, but the Calypso cannot hold a candle to the Cary -- not in terms of sound quality, build quality, pleasure of use. This may not be much help, but my experience after owning the Calypso was that I preferred to go over to the Cary line than to move up the Aesthetix.

Cary pre,Cary amp,there's a natural synergy there.

I liked the Calypso OK but it was easily bettered by the PS Audio PCA-2. I think the Callisto is probably a better Linestage than the Calypso but I haven't heard it myself.