Any suggestions for amp for Legacy Whisper XD

I'm looking for a 2 channel, up to $2k used amp to run some new Legacy Whisper XD's. These have powered bass drivers - 500w ICE to each side - 2 x 15". Since the bass is taken care of, what amp do you like for great mids and highs? Would a class D matchup better with the built-ins?
Mainly listen to hard rock, blues and metal.
Thanks