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I'd settle for my Katana, not because it's perfect but because it's good enough for me.
Worrying about which set of valves or does it need biasing is not something I can be arsed with any more - "can I carry it up stairs on my own" and "does it work" * are far more important.
* I realise they've not been out long, but if they're as robust as my old Cube 30 Bass workshop amp then I'll be happy.
Even if five years from now it explodes in a ball of flame then it's cheap enough to buy another one without feeling I was robbed.
With a Celestion, 1 to 1.5 times the amp rating is fine. With almost anything else, 1.5 to 2 is safer. With things like old Goodmans and Fanes, more than 2 is best.
In the Princeton, a 15W Celestion Alnico Blue is perfectly OK - Vox put two of them in an AC30 and they very rarely blow unless someone puts bass through it or something. (Quite common in the old days!)
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
I see plenty of amps that don't have a ratio anywhere near 2.5 times. I had a 22W Fargen several years ago that came with a Celestion Greenback (rated at 25W). Fender have supplied limited edition Hot Rod Deluxes (40W) with a VIntage 30 (rated at 60W) in the past. I'm pretty sure there was a version with a Jensen P12N (rated at 50W) as well. The 2 and half times rating is probably being a bit conservative.
It does depend on the speaker. Some are more conservatively rated than others. Celestion are very robust - especially the Blue. Jesse Hoff uses a Blue rated at 15W in a 20W amp. The Vox AC30 used two of them as well so in theory was right on the limit. I have heard of people putting a Blue in a 22W Deluxe Reverb although that might be pushing it a bit far. The Blackface style preamp tends to be more scooped with less mids and more bass than a tweed or Vox style circuit.
Edit: Just saw @ICBM's comment. A 20W speaker in a Princeton does put it in the 1.5 - 2 times range that he suggested.