Upgrading from Integrated Amp to Separates


I have a Primaluna Dialogue Premium HP integrated amp now, driving Harbeth M40.1's.
I like the sound, but am considering upgrading to something more powerful and with greater finesse.
I have had solid state gear in the past and have always come back to tubes, so I think I want to stay with tubes.
I would like to get a stereo amp (no monoblocks) and match it to a very nice preamp.
I have been considering Balanced Audio Technology gear but beyond that I really don't know.
For my budget, I would prefer not to go over $10K total for both components.
I am in no hurry to make this change, just thinking and doing research right now.  I am willing to take more than a year to decide if necessary.  
Please give me your suggestions.
Thanks!
Peter
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I have the PL Dialogue Premium and went to BAT separates. VK55 amp and VK31SE preamp with great results. Yes they are older but sound fantastic. With your budget I'm sure you can get better.  Grannyring brings up a good suggestion also.  I know another Audiogoner went this Lyngdorf route and is really happy with his choice.  
Another popular choice with the Harbeth speakers are the Luxman integrated amps.
Integrated Amp >>> Separates    Linear Tube Audio MicroZotl Preamplifier + Zotl Ultralinear present an interesting pairing for the Harbeth 40.1s. They come in at budget and keep you in tubes!
Don't forget about Audio Research.  I think they are very nice for a tube amp/preamp choice.  Probably the most transparent "solid state" like tube equipment.  BAT is nice and powerful, but I have read they are dark sounding.  It really depends on what your after. 
What SS gear have you owned? If you haven’t listened to Pass or Modwright you might be surprised.