Tube Pre-amp Suggestions.

There are a few Audible Illusions models on the used market.  I have not heard them but consistent praise ... service, on the other hand consistent difficulty:

https://hifizero.com/index.php?q=audible+illusions

https://www.audibleillusions.com/

@kds https://forum.audiogon.com/posts/2808600

The Rogue RP-7 Preamplifier features two pairs of balanced XLR inputs. It also includes three pairs of RCA line level inputs. 

Another vote for Audio Research.  I have a SP9-MK2 and have been itching to get something newer and still haven’t pulled the trigger. Depending on you finances, the LS-28 is really good and of course there’s the REF series.

Oh and why are you wanting to sell 8 watts of Class A goodness?

The benefit to a reasonable tube preamp there are always better NOS tubes that will make it better or tune to your listening preference. 
I use Brent Jessee Recordings and Supplies on line. Super informative and probably knows my equipment better than I do

I see that not too many tube pres offer balanced inputs, any thoughts?

Among the three noteworthy alternatives, i.e., 1. Freya, 2. RP-7 and 3. VTL TL5.5 Series II Signature (2013), TL5.5 II Sig. has the best impedance matching feature.

https://www.stereophile.com/content/vtl-tl-55-series-ii-signature-line-preamplifier

This trio has received high praise from Stereophile, but impedance matching deserves careful consideration in the DAC → preamp → amp chain. The Freya has a low input impedance, while the RP-7 has a extremely high output impedance at low frequencies.