Tube Curious - Preamp Suggestions

I actually think ARC would be a great place to start. Shindo, CJ, etc. are great pres, but given your current system as your sonic reference they may make a fairly drastic change that might risk going too far in the other direction. My guess is adding an ARC pre may add a nice dose of musicality that may have you rethinking the amp purchase, which could end up saving you $$$ in both equipment expense and your electric bill. I've heard the Bel Canto amps sounding awfully good in several different systems. I think VAC is another good pre to consider but would likely sound perhaps a touch softer, lush, or more "tubey" than ARC, which may or may not be a good thing.

My only caution is that there have been some reports of some ARC preamps possibly being damaged by being paired with certain non-ARC amps (can't remember specifics but it was a thread here within the past year or so). Just something to explore further if you go this route.

My last thought is that I don't see a power conditioner listed in your equipment list. If you don't have one that could also yield significant improvements in removing grunge that could be affecting the overall musicality of your system, especially since you're running "digital" amps that tend to benefit from power conditioning. I'll also throw in a strong recommendation for dedicated lines. It never ends. Best of luck and please keep us posted in whatever you decide.