First tube preamp recommendations (under $5k)


Right now have di20he -> terminator -> he9 -> pass x350.8 -> ATC scm7 / NS5000.
I am thinking of introducing some tubes into my chain. I like the sound I am getting but want to explore what tubes can do to the sound (slight warmth, biggest soundstage, better layering etc etc). Don’t want to go to nuts on price. If price is over $5k would consider if its really exceptional (but for sure not over $10k). Totally fine with used. Balanced would be nice but not mandatory.
So far I am thinking RP7, EVO400, bhk. Any thoughts?
smodtactical
has anyone noticed the price of used Shindo preamps?  
not even close to the OPs budget- if you can find one.  
+1 Modwright LS100.  You can pick up one with optional tube phono stage for 1/2 your budget.  I run a McIntosh C500T in my main rig and I am shocked at how well the Modwright 100 performs in my second rig.
I went through this exercise.  Considered all options with budget being secondary. 

Ended up going Prima Luna Evo 400 integrated and got it well under 5k.
I have nothing but good things to say about this.  I have relatively inefficient speakers (Dynaudio Evoke 50) and it drives the hell out of them.  The website is worth a read.

Recognizing this might not be an amp I pass down to my children, for my ears and money, this gives me great pleasure.
cary SLP98p in your price range even with mods.   Have had mine for years and it still warms in the most pleasing manner.  I'm run mine with a variety of SS mono-blocks and couldn't be happier.  Also I am currently using a superb Cary 200ts DAC as a digital preamp in my office.   It has selectable tube  and SS stages for the analog outputs and again hooked directly to monoblock SS amps, crazy nice and the 200ts is currently on sale from Cary for $1900.