Just replaced my W/P 8 with Sashas. More musical less analytical.
I demoed them with the ARC 150 and it sounded great. Very musical with great dimension and extension at reasonable volumes. But if you like higher volume with a powerful low end, you may want to consider more power. During my demo, I played a Ref Rec CD, Jazz Kaleidoscope, with very low frequency and it did choke up a little. I'm using Spectron Mono-Blocks with over 800 watts per channelin mono-block form which, to me, is a better match.
With that said, the Sashas are fantastic and I much prefer them to my W/P8s.
Enjoy
Brett