Best balanced tube preamp for NHT XD System?

I'm hoping to receive some guidance on the best tube preamp for a NHT XD 2.1 (hopefully soon to be 2.2) setup. I'm presently using a Parasound JC2 and am mostly pleased. The Parasound is fed exclusively by a Benchmark DAC1. The sound is wonderful, but slightly on the "clinical" (as opposed to "warm") end of the sound spectrum. I'm hoping that the tubes can solve the problem. I've read a single (highly favorable) review of someone who matched the Cary SLP 03 with an XD setup, but the reviews for this preamp are scarce and somewhat mixed. I have a less-than-ideal Sunfire Classic Vacuum Tube preamp that needs to be refurbished and would prefer to go another route. Finally, and as a reminder, I would also prefer XLR balanced in and out.