Recommend a SS amp for my new Vandersteen Quatro CT

IMO
you are putting the $ in the right place - I think you will be amazed how good the ARC gear sounds
i use a REF5se
who is setting up your Quatros?

Dallas dealer "audio concepts" will do the set up 

I have not heard the ARC, but know them to be well made. I don't think you will have any problems. Perhaps contacting ARC to see if they recommend updating. Again, I don't know how old the amp is, but I do know that capacitors don't last forever. (Though my poor old Adcom 555 is still functioning after 24+ years).YMMV
Bob
And, I am envious. I would love to have a pair of Quatro CT's.

I will send the 100.2 to ARC for a checkup.  I figure whether I use the amp or end up selling it I would like to have ARC giving it a good bill of health.  As much as I like that amp I will be surprised if wins out against the 4bsst2.  I know there are many Bryston detractors here but I find the sst2 to have a more refined character than the older Bryston amps.  The SST2 was absolutely better for my fairly low efficiency stand mount monitors.  The extra power and bass control made those speakers come alive.  With the Quatro it may be a closer call because I will be filtering out most of the frequencies that are the strength of the Bryston.  So I am anticipating it will be more of a midrange shootout.  Thank you all for your suggestions.  I have heard Ayre and Aesthetix mentioned before.  The dealer where I am buying carries neither brand and auditioned them for me on ARC Reference Pre and Power amps. 

I did not mention Bryson because I have zero experience with them on Vandersteen's. I am NOT a detractor - I have a good friend with two pair of big B&W in well designed rooms running them - try it !!!!
Good call on service checkup of the 100.2 database says something like 1999 thru 2003 production so a refresh might be good.
again - excited for you !!!!