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
The vast majority of Audiophiles donot know what’s inside or the parts quality,did you know on average only 25% of your amp,or preamp cost $ is all that goes into your commercial brand ? The rest overhead and markup , that's why many have their equipment modded .that's how Dan Modwright made it popular.
for tube Gear I have used Radu Tarta one of the best Vacuum tube experts in North America hand built and with Premium parts throughout that is the difference ,and  with or without remote which for a top quality resistive remote  $400 ,not like most using a cheap $25 Alps volume pot,big loss of fine detail,and transformers and chokes are the key ,Lundahl,and  Monolith ,much better precision then lesser capacitor based output stage . In this case built one at a time and 70%of the cost  go into the parts ,in name brands it’s just the opposite 30% or less 
I have  found this out years ago , He Builds low power SET amplifiers, and DHT Tube preamps, only 1 gain stage which is the purist.most have multiple stages.
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.