Stereo Integrated Amp for Q Acoustics Concept 500

Hello music lovers...  I recently bought a pair of Q Acoustics Concept 500 speakers. So far I'm absolutely Loving them! the difference is huge compared to the Wharfedale Aura 4 I had before. Way more honest and neutral, wider and taller soundstage, more depth and micro details. I listen mostly to CDs, classical (orchestral and chamber), jazz, some world music and some folk rock. The speakers are being powered by a Marantz Model 30 and even though I feel there is plenty of power and control, the Marantz sound is perhaps a bit too smooth for the Q acoustics (which are a bit smooth as well). was wondering if anyone would have a recommendation for an integrated amp with more dynamic power/lively, more contrast than the Marantz to try it out. The Marantz is really fine so I really don't know how much more I can extract from the speakers. Would love suggestions from folks who have REALLY compared different amps. My budget can't go beyond $5000. I thought about trying the McIntosh MA252 (maybe too warm sounding), or Anthem STR...or something from Rega? Elicit MK5? thanks in advance...