Common Sense Audio offers a 300B-based integrated under the name Audio Nirvana for $1.5K that, to my ear at least, was not far behind a similarly-spec'd Audion amp that costed four times as much. Could be worth looking into. See here for details:
http://www.commonsenseaudio.com/nirvanaamps.html
(To be clear: I am not in any way affiliated with Common Sense Audio...just liked what I heard)...
http://www.commonsenseaudio.com/nirvanaamps.html
(To be clear: I am not in any way affiliated with Common Sense Audio...just liked what I heard)...