Best speakers with Pass labs X-350.5

Hi, my current system is:
Meridian 588
Arc ref 2 mk2
Pass X-350.5
and ???????????
Does anybody have any suggestions?
I'm considering Dynaudio C4, Evidence Temptations (used), B&W 802D (whisper treble?), Wilson WP7 (hot treble?) and Alto Utopia Be (lean bass?)
Thanks