I have owned in the past an Audio Research SP7, SP9, then an SP14, LS25 MKII, and finally a Ref 5SE. I really enjoyed the SP14, and then later the LS25 MKII. I would say either of those would keep you happy for awhile. Although they are designated tube preamps there is only one tube to deal with when time to replace it. If it were me and choosing between the LS25 MKII and the SP14, I would pick the LS25 MKII. That may be over your budget but it does sound better.
Used Audio Research Preamp Options
Before I pose my question, I do admit that I expect mixed responses since the question is somewhat subjective. That been said, I think I have pushed myself into an obsession to own an Audio Research preamp. I know there are better preamps out there for the money and I might ultimately overcome this obsession but I'd like to hear from folks who have owned different ARC preamp's over the years about their personal experiences. So here is my question: if you had $2500 to spend, which used ARC preamp would you buy? A line stage component would be fine, tube or SS. I'm also making an assumption which may not be completely valid and that is any of these preamps will be an upgrade from my NAD C165BEE. Any comments will be appreciated here too. My other components are McIntosh MC2200 (100K impedance) and a Vincent SP-331 ( 47K impedance,150w in 8 ohm/300w 4 ohm) amplifiers. Not sure if speakers matter- ML Aerius, Def. Tech. BP20 since I'm also looking for an upgrade route there too. Thanks.