Herron 1A,, Herron 2A, Modwright LS100 or Aesthetix Calypso?

I owned a BAT VK 30 and didn't care for it.  I had a Calypso about 8 years ago and regrettably sold it to try an integrated.   Ended up going back to separates and got a decent deal on a used Calypso Signature with good NOS tubes and have had it for approx. 4 years with no issues.   I have no interest in trying other preamps.  The Calypso and Calypso Sig. when tubed properly are hard to beat.  

I've heard good very things about Herron, but have not tried them.  It's a brand that seems to fly under the radar, but has a loyal following.

I've owned two Modwright digital sources and found them to be decent, but not good enough to keep. 

Are you finalized on your choices?

Not at all.

I have both a Modwright LS100 and a Herron 1A, both are very good preamps, but depending upon what sound you are after they differ. If you like the sound of 6SN7s (my partiality) swap in either NOS Sylvania or new production Sophia Electric or Black Treasure CV181s, as well as a NOS 5AR4; find it very enjoyable with good sounstaging, separation, no over-emphasis of treble, mids or bass. I purchased the Herron used a a potential back-up, but it now resides in my second system. It is 6922 driven and has a transparent sound with good soundstaging and separation. I haven't tube rolled the stock tubes , if I did I might try to soften it a little with NOS Mazda. I have used them as well as Phillips Miniwatts and Siemens in my Modwright Elysee DAC with very good results

LS100 is the 6SN7 preamp I'm referring to above