If you’re thinking of a pair of 7.2s, you can’t fiddle around with little amps. You need big power, so look to Threshold or Pass or Krell, etc. If you like the sound of the Classe, look to one of their bigger amps. With a volume control on the Hegel you might not need a separate preamp so more of your resources can go into the amp. Couple of possibilities:
https://www.audiogon.com/listings/solid-state-threshold-stasis-7-0-2017-01-20-amplifiers-75243-dalla...
https://www.audiogon.com/listings/solid-state-pass-labs-x250-solid-state-amplifier-2017-01-21-amplif...
https://www.audiogon.com/listings/solid-state-classe-ct-2300-balanced-stereo-amplifier-2017-01-21-am...
https://www.audiogon.com/listings/solid-state-threshold-stasis-7-0-2017-01-20-amplifiers-75243-dalla...
https://www.audiogon.com/listings/solid-state-pass-labs-x250-solid-state-amplifier-2017-01-21-amplif...
https://www.audiogon.com/listings/solid-state-classe-ct-2300-balanced-stereo-amplifier-2017-01-21-am...