$200 is a very good budget. Brent is a good guy, so that is great if you buy from him.
I recommend the RCA 3 MICA Black plate 5814A tubes from the 1950's. Nice warmth and bloom - good transparency and dynamics...maybe $77 a pair. Also, the CBS 5814A - less warmth, better extension on top and bottom, great transparency. Raytheon is also excellent and similar to the CBSA.