Amp recommendation for KEF LS50


I’ve had the LS50’s for a while now and have been saving up for a new integrated to power them. Currently using Rotel ra-12 which sounds good but I was wondering if anyone had any recommendations in an amp that pairs well with the KEF’s. I have a budget around $2k and can stretch to $2,500 if need be. Not many dealers in my area so any help would be greatly appreciated! Also, room is roughly 12x15.  I have added room treatment to help as well.  
mgrec42
I heard the LS50 with Primaluna integrated - I think the basic model, and they sounded fabulous. You could get the HP model within your budget.
this might sound like a dumb question, but I have never owned a tube amp..what do they do to the sound in comparison to solid state integrateds? (which is all I've ever owned)..Also, do tube amps only perform well with certain genres of music? I listen to a wide variety..
I borrowed a Primaluna integrated (Prologue) from my local dealer recently and it sounded fantastic!  This was my first foray with tubes and I was impressed by the impact and large soundstage; nice, tight, deep bass too.  I've never heard the LS50's, but I can vouch for the Primaluna.  Another great amp in your price range is the SimAudio 250i. Occasionally, you'll see the Sim i-1 (original 250i) for about $800 on Agon.  I liked it so much I eventually bought their 700i.