Best amp for ML Z Quests?

I own Monoliths, have friends with Quest Z, and SL3. I have heard all of them driven by Levinson amps (20.0, 23, and 27). I have heard the Quests driven by McIntosh tube amps and AR tube amps (although I don't know which model). I have also heard the SL3 and Monolith driven by Krell amps (KAV on the SL3 and KMA 160 on the Monolith). I did not care for the Krell (great bass, but not smooth enough on the top end for me). I also did not care for the McIntosh--it sounded rather mushy and not well defined--too tubby. The AR and the Levinson were the best. The AR offered a very nice bloom and large soundstage. It did not have the bass control that the Levinson did and did not have quite as clear a definition--but a great sound. For me I chose the Levinson, but that's just personal taste. I think the AR was equally as good, but different. Now that I am bi-amping I would love to hear the AR again on just the panels. I think that would be a really great combination.