As Steve F implied, output power is a consideration. You mention horns, so there is a good chance even flea power stuff will work just fine (like Bill's Simple 45). I've been messing around with some PP stuff lately, both using autoformer phase splitter and using a differential input. Both sound really good (tons better than your typical Mullard or Williamson design), I think the diff amp one is cleaner sounding. If you keep your outputs in Class A and Triode (either using an actual triode or use a pentode connected triode) you're in good sonic territory. This opens up a lot more speaker control and "watts of fun"! For an idea, take a look at Allen Wright's PP-1 amp. A refined version of this is available as a kit using 300B's. I've built the PP-1 from scratch and it is an outstanding amp. That front end will drive anything you can throw at it. I don't know what this kit costs, but going from other prices I've seen for their stuff, it isn't inexpensive! Anyway, best of luck!
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