Check out Brent Jessee's site, audio tubes. Just click on the tube you have and read his take on the stock he has (which is constantly updated). It's even broken down to price points. When you narrow it down, give him a call and see what he thinks and if he has anything new that hasn't been updated on his site. It can be your first and last stop for tubes and advice.
All the best,
Nonoise
All the best,
Nonoise