well, after Scott's post, I might be prone to try the TAD short bottles, available from Mojo for $32 a pair, or available from Lord Valve as SHUGUANG "SHORTBOTTLE" BLACKPLATE 6L6WGC @ $35 a pair
after that, the choices would be the SEDs (FORMERLY "SVETLANA" - I know, it's confusing!), the JJs, which are pretty stout, and IMO bias a little differently, or the "new" Svets
for preamp tubes, I'd try a GT 12AX7M in V1, or the Sovtek LPS or Chinese "C-9"