I heard the original versions with Copland 288 CDP, Hovland and CJ 17 preamps into the W-5. I was a very nice combination. I also compared that set up using the Levinson 334 (125 wpc) power amp. I preferred the Levinson amp because it was more refined sounding, with better details. The Levinson would run out of steam if you really like to crank the music IMO. Now remember this was a while back and I am not sure if the W-5 was the 170 wpc or the 190 wpc amp (I also do not know how much of an improvement the W-5 is over the earlier version, if any). I also heard teh McCormack DNA-225 and CJ 200 wpc amps. The Sim bettered these amps in the same set up.
Hope this helps and Happy Listening.
Hope this helps and Happy Listening.