The Cary SLP does he mean the SLP 98? Don't think there was an 89.
What kind of cables is he running? Musical preference?
The Parasound is warm does he want warm both the Cary and the Prima Luna would be a bit on the warm side?
The Naim Ndx 2 is excellent it is not overly warm like most Naim gear is, rather clean sounding, great feature set.
Is he going with a tube preamp for soundstaging or to amelorate a perceived brightness?
The SLP 98 was a fantastic preamp very musical and not too lush. Pesonally if he does not want too much warmth then the CJ ET 3 now discountinued would be more neutral. The ATC are very well balanced and are neither dull nor bright, the amp is a bit on the warm side.
Hence we are trying to find out what the OP is trying to create as a sonic balance.
Dave and Troy
Audio Doctor NJ