The input output matching here for the amp and preamp are key ingredients in the equation.
In theory, the cj, probably requires that you reverse the leads at the speaker, inverting absolute polarity, which is necessary, since all, I think, cj's have an odd number of gain stages. You may want to confirm this with Tor at cj. Call him and tell him that Larry Staples told you to call, and when you do so ask him how his new hip is!lol!
Seriously, you should call Bryston, and ask them for their best advice, and knowing them, they will, after of course recommending their own which is matched perfectly in terms of input output impedence give you great advice. They are good and reasonable people.
In general terms cj is softish in the upper mid high end. Beware of any gear that you need to cover up some notable problem with though. Sim Audio, to be fair makes very good gear, and while not as glossy sounding as cj should be darn good. Most all of the hardness that solid state has suffered the slings and arrows of through the years are absent here. You should know, though, that I made a very good living in a former life mixing tube preamps, especially cj's with solid state from other manufacturers. Nowadays even their solid state stuff has the same kind of smoothness.
Good Luck, and if you need any more info you can email me personally.
Larry R. Staples