How long do you anticipate living?

The one big advantage of buying tubes from Steve is that he thoroughly tests and matches tubes, and his process tests for a few factors others don't. Everytime i've gotten a tube from Steve it has been a top-notch example of that type and has given no problems.
I am using his tested and matched 6N5P and output tubes in my components and they really deliver.
As to what will work best in your system. . . it's really hard to say. Rooms and personal taste in sound play a large part and individual results vary. I know the temptation to save 10 percent on a large amount of tubes, but it may make more sense to buy just one of the different types you wish and try them out before committing to larger quantities.