Conrad Johnson,SimAudio,Thiel - Good Match?

I am drooling about a tube preamp, but I am not sure how it would sound with my current setup. My current setup is a Simaudio P5, Simaudio W5, Simaudio Nova CDP and Thiel CS2.4 Speakers.Naturally the P5 would be leaving for a tube preamp. Has anybody had a Conrad Johnson pre(17ls or 16ls) with a Simaudio W5 amp along with the Thiels.Want to get some opinons on the synergy of these two highly reputable pieces of gear before taking the plunge, I live a long way from any dealer so an audition would be hard to arrange, plus I am going to buy used anyway,just need some honest opinons from the Audiogon gang