Integrated amplifier for ATC SCM 19v2

I recently upgraded my speakers to ATC SCM 19V2

I mostly listen to 70's - 90's rock n roll, jazz, blues and instruments (piano, guitar, etc) in a medium / average sized room.  Listening levels are generally at low to medium levels, sources are currently CD and Bluetooth.  Am in process of ripping my CD's to put on a hard drive so streaming is definitely in my future for ease of listening

My current equipment is

     Primare I32 integrated amplifier with DAC

     Audiolab 8200 CD

     REL T5i sub

     Kimber Kable 12TC (2×4) speaker cables

My goal is to get a fuller, more musical and clearer sound with a better amplifier and am ope to buying demo or a clean used item.

Any thoughts or suggestions from current or prior ATC SCM 19V2 users would be greatly appreciated 

Thank You