What Audio Research preamp would be an upgrade to my LS2B

I moved from an Audio Research LS2B to an LS25 mk2 and the difference was huge. I have now moved to a Ref 5se and again the difference is huge.

 The LS25 mk2 is really a  nice preamp, Very detailed with a large 3 dimensional sound stage. It would be my suggestion unless you can afford a Ref 2 nk2 or Ref 3.

Kenny,
I always liked the ARC products and I am happy with the LS2B but the bug has me wanting more? As far as budget I will pay for the right fit. The LS2B is the Mk 1

Lostbears,

It was from someone like you that I was looking forward to hearing from. Thank you for your input because you know the LS2B and made the move. I haven't heard the LS25, but you say it is a big improvement Oh boy! 
 

(((LS2B but the bug has me wanting more? As far as budget I will pay for the right fit.))
 Take a listen to the new LS 28 I have compared the various ARC line stages over the years although always decent the latest group ac-cells well beyond what was ten years ago or even more recent years efforts.
 Best JohnnyR
 ARC dealer

 The LS25 needs to be a mk2. I compared the mk1 and mk2 and the mk2 is much better. The LS25  mk2 and Ref 2 mk2 were the first ARC preamps to use the 6H30 tube. After having my LS25 mk2 for a number of years I thought about upgrading.  I brought home a demo LS27 for a weekend. But in the end thought t was not worth the upgrade. In my system the LS27 sounded a bit thin to me and lacked the body of the LS25 mk2. It really took me the Ref 5se to convince me I needed to upgrade.

 If you can afford it though I would opt for a Ref 2 mk2. I like the tubes in the power supply. I think they really add something to the sound. 

 Either way I think you will be amazed at the difference. Preamps have come a long way even in the last 5 years. The Ref 5se continues to amaze me every day. I like it so much that I upgrade my phono preamp to the matching Ref Phono 2se