Best Audio Research Tube Amp for Proac 2.5's


Help/advise appreciated. My current system includes a Rogue 66 pre, the Proac 2.5's, and a new CD Player yet undetermined (Arcam? Cary? Jolida?). I've heard good things about the ARC/Proac synergy, but don't know which amp to get. Thanks very much.
peter_s