Check out Audio Space gear. I recently purchased a Reference 2 preamp and am very happy with its performance and quality. Peter Lau (the founder and lead designer of Audio Space) won a lifetime achievement award for tube amp design in Japan, and is the first Chinese to ever win that award in Japan. Peter Lau does arguably the best 300B implementations on the market. The Reference 1 monoblocks and Reference 2 preamp both won product of the year awards in Japan.
http://www.avguide.com/review/audio-space-reference-2-linestage-preamplifier
http://www.soundstage.com/revequip/audiospace_reference_two.htm
Depending on what your budget is, if you're looking for a power amp, check out the Reference 1 and Reference 3. If you want an integrated amp, Reference 3.1. If your budget isn't quite that high ($4-20k), they have lower-end models like the Nova. You can see a full product listing at www.gini.com
Reference 3.1: http://www.avguide.com/review/tas-194-audio-space-reference-31-300b-integrated-amplifier
If you're fine with an unbalanced preamp, the Reference 2S is, according to Peter, 90% as good as the Reference 2 in unbalanced mode, at less than half the price:
http://www.6moons.com/audioreviews/audiospace5/1.html
If you want to talk to a good US dealer for Audio Space gear, call up Walter at Underwood Hifi. He'll set you right.
Edited by Elysian - 11/11/11 at 2:30pm