Since Paradigm speakers tend to be a bit forward I have a Studio 60v3 by the way. Which would complement better with my Paradigms? Lexicon CX5 Aragon 3005 Parasound A51
Goal: I want the sound to be less forward at mid-high.
Parasound HCA amps will not tame the upper forwardness that you are experiencing. The Halo may be the best choice on your list with the Aragon next. Don't know about the Lexicon.
Have you given the B&K reference a listen to? It might be the sound you are looking for at a good price. For significantly more the Classe and CJ amps are even better.