Well, that is the exact model HK I just upgraded from. I run Axiom M80v2s. The improvement with the RR2150 is significant. I was always impressed with the HK bang/buck ratio too. But RR2150 is in a different league.
FWIW, here's a review from recent JazzTimes:
http://jazztimes.com/reviews/audio_video_files/reviewDetail.cfm?ReviewID=43

After reading that I figured what the heck - 30 day home trial and all that. Was sold in 30 minutes.

Good luck!