Back in 2003, Rosemary and I decided to set out on a quest for our definitive speakers. In 2005 we had found them in the guise of the Tidal Contrivas. I continue to assert these are the last ones. Only ... meanwhile there is a new standard version of the Contriva (2 ceramic bass drivers) ... and then there is the Contriva Diacera version (diamond tweeter) ... so the Contriva could just be sort of the last speaker ;^).
As to your question for synergy. I bought my amp/preamp combo with a clear understanding they had to serve the Contrivas as best as they could, so that may mean definitive gear as well (sort of, Id like to get a Tidal Impact for the Tidal Intra, sometime).
With all these final bits, luckily I can still play with the second system.