I ran a Calypso with a Krell FPB 300-C. Great combination. Only get the Calypso if you are willing to roll some tubes - that is what makes it so magical. The stock tubes are installed to simply allow people to break it in before putting "real" tubes in it - IMO. So if buying a Calypso, plan to add several hundred dollars for tubes to allow it to perform properly. There are lots of posts and comments on tube selection for the Calypso - read those.
In the end, the Calypso with Krell FPB 300-C to Wilson speakers was my best sounding system ever!