I play loud too. I think my lowest wattage amp is a Splawn Competition, or a few Trainwreck clones and most are either 50, 60 or 100 watts, and I play loud with my band (Stage volume is too loud) and at home I'm lucky to be able to play loud (my ears aren't lucky anymore though) . .Anyway, I actually measured at home the other night just for fun and it was hovering around 106db. I seriously have never had 1 go bad. They also don't affect tone near as much as a V1 or V2 tube on most amps, but if you really want a NOS one, either RCA, Sylvania , or GE would be fine. I have a huge tube collection and I wouldn't waste any of the really good stuff for the PI's This is only my experience , and others might vary, just trying to save you money. Get different tubes for the other positions though if you don't have a lot of tubes, as then you can experiment with tone .
Eric