Audio Research Ref 10 vs 40th Anniversary preamp

Was wondering if any of you guys could tell me what you think a good price on a ARC 40th Anniversary pre is?

At what price is it too much and am I better off just moving to a newer ARC pre model?

Is it better or as good as a 6? They seem to be around same price as a 6?

Trying to decide on a non tuby tube pre for a pair of Pass Labs XA-160.8 mono's driving Magico S5 MK II's. Thanks  

The "trade in your old AR gear on new ARC gear" is BACK.Just to mention.       
I still have a ARC PH-2 laying around. And use a SP-15 for the phono section to this day...

@fsmithjack re real world pricing I just sold my Ref 40 for $10.5k, I’d say under $11k you are getting a fair price. Only pay above that for a dealer piece with warranty. My piece had new tubes and other extras as well.

I sold it because I came to find the ARC house sound overly warm, lush and colored and that was a poor fit with my new speakers. I switched to the VTL 7.5III which is much more transparent and clean sounding. The Ref 40 sounded nice, but it definitely had a sound ...

fun thread, I have spent a considerable amount of listening time and every now and the. $ with Randy at Optimal. He is always in top echelon of ARC dealers in USA.

I have a REF5se up on Ayre blocks with a NOS Tungsol coke bottle 6550..... yowsa....

when I eventually get the wandering ear the VTL, VAC, et al will be on my list for sure, along w current ARc offerings...who knows, maybe Vandersteen will debut the long rumored preamp to match his wonderful high pass amplifiers...

fun !!!