Aoliviero - well done. I especially like your comment about the CAT preamp: it is paramount to have a "cornerstone" in any system. If you want to go further with your Raven AC, I would recommend getting in contact with Solong on Audiogon. His set-up of the Raven AC-2 is exemplary and does lift the Raven AC way above the Black Night performance-wise. I agree with all your comments on the Graham and Triplanar tonearms. A well choosen and clever system. One that will certainly perform way above its price-level.
Smart.