It wasn't on your list, but you might consider a Linear Tube Audio MicroZOTL preamp. I upgraded from two different conrad-johnson preamps. I was worried that I would miss some of the warmth that the older c-j preamps are known for, but I didn't. I'm using mine with a Coda solid state amp.
Tubes make a big difference in the LTA preamp. Telefunken and Siemens work best for me.