Wow! That is very good general advice from Freediver. I am also a big fan of EL 84 amps of modest power output. That tube can be utilized in pretty modest amps to great result. For the same reason I like 6L6 amps and KT 66 amps. Vintage amps can be extremely good and cheap, but, the problem is it takes experience and know how to get the best out of them; it is not that easy to be a rookie tubie. If you have access to a shop that can give you help, that would be the way to go.
Tube gears varies much more than do solid state amps. Some tube amps are leaner sounding than most solid state amps—whether that is good or bad depends on your set up and taste. You should try to hear as many examples as you can to get a better idea about what to get. The other approach is the way most of use to slowly get where we want to be—trial and error with fun, but also painful, substitutions over many years.