I don't know how much money you want to spend. But I can share with you my experience as Canary owner. I have the Reference power amp and CA 903 pre. Since both Canary pre and power amp have "honest" or neutral sound, depends on you music taste, I use Tara Lab Zero long i.c between pre and power, Crystal Cable Ultra i.c from TT/digital to pre. If you want to add little coloration, I had also used MIT V1.1 ic, but at the sacrifice of losing punch and dynamic (compare with Zero). It all about synergy and musical preference. I have also tried out Conrad Johnson Premium 10 pre-amp,it adds the mid range magic of 300B tubes, but loses the finesse and delicacy of the highs.
The Canary system you have is very dynamic. CA906 has fuller mid range (due to 6SN7 they use), but not dynamic as CA903.
The Canary system you have is very dynamic. CA906 has fuller mid range (due to 6SN7 they use), but not dynamic as CA903.