Audio Research SP10 vs ?


I'm finally considering replacing my ARC SP10II. I'm looking for something with the same tonal signature, dynamics, etc, but with better resolution. New or used.
newbee
I own an SP-10, SP-11 and the new Quicksilver Full Preamp. The latter is what stays in my system and, at $3900 including an excellent phono stage, it is a bargain in today's market.
Since you got used to an Audio Research two box preamplifier you need an Anniversary Edition Reference Preamplifier ...