Which RCA IC's to use with McCormack Amps?

I would like to hear which RCA's folks here use with their McCormack Amp connected to their Preamp. I have the DNA1 Deluxe and I am using a pair of old Monster Reference 2's. I don't have any experience with high end RCA's except that I purchased a pair of Kimber Hero's and found myself going back to the Monsters. Kimber although very detailed and neutral didn't seem as good a fit with an already extremely detailed amp. I would like to know which RCA's and at what price range people are using so I have an idea before I go shopping. My other components are: DNA HT1 Deluxe, B&K Ref50 HT processor, Toshiba A3 HD player, generic 10 awg speaker wires. Thanks for your inputs!