Sonus Faber Il Cremonese Amp Pairing suggestions

I'm a newbie and this is my first post on an audio forum. I got into the hobby a little over a year ago looking for the best combo for enjoying 2 channel stereo and home theater. Since then, I have upgraded my gear multiple times and now taking a huge leap on my front towers from Lumina V to Il Cremonese.

I'm currently running: Anthem STR stereo amplifier (600W/ch to 4ohm) powering Lumina V, AVM90, MCA 525 gen 2 5 channel powering Olympica Nova C2 center and Lumina II surrounds, Wireworld Equinox 8 speaker cables and silver eclipse XLR. I also have 2 JL E112 subs. The STR really brings the Luminva V to life with excellend imaging and clarity with a crossover at 100hz.

Although I love the DAC on the AVM90, I understand a stereo preamp/DAC is a superior solution in the future. I wanted to get the best speaker possible, then build my 2 channel around that by upgrading amps, speaker cables, and preamp. 

I've been told that the STR amplifier isn't sufficient to enjoy the Il Cremonese like they should be played. The Mcintosh MC611 pair and Luxman M10X have both been suggested to be as a solution under $20k. I'm interested to hear if you think the STR would be a "laughable" pairing for the Il Cremonese? And what other suggestions you may have?

I really appreciate your feedback and time! I've enjoyed reading this forum for the past year, but haven't found any threads that exactly address my situation. Thank you!