Rhyno, i owned the WP6's for three years and never regretted one minute. they seemed to synergize with many amps.....from the Levinson 33's.....to the Halcro DM-58.....to the Atmasphere MA2's.....and even the Tenor 75 watt OTL's. the Tenors wern't the ideal match.....but even 75 OTL watts sounded great in my small room.
the WP6 would tell you if an amp was edgy or on the dry side.....the Halcro match was not to my particular tastes.....but i know others like that combo.
for what you can currently purchase WP6's for used.....i'm not sure what could be much better unless you are running SET's in a large room.