Tube Preamp for 4B SST2


Hello
I am new and this is my first post here, I recently bought Bryston 4B SST2 to improve the sound quality of my system below:
Logitech Squeezebox Touch streamer
Cyrus 6 CD
Perreaux DP32 (DAC/Pre)
PMC FB1i

I heard good things about the synergy between ARC and Bryston, and would like to buy and ARC preamp and currently have a good offer for a new SP17L for 2500$.
I know auditioning is the best way, but can't audition any ARC preamps here,
How do you compare the SP17L to other ARCs and do you have any other ARC suggestions? appreciate your help.
amro200
The Ref Series is above my budget, am lokking at lower price ARCs but I need some experience.
The BAT preamps sounds like a another intersting option and the used VK 31SE is about the right price to me,
How do you guys compare the sound signature to Audio Research, and is there's any experiences and specially with Bryston power it will be very useful to me.
I know someone who loves Aesthetix preamps through Bryston into PMC speakers.