Is there any reason why you’re considering the O/96 vs two other speakers that are basically than half the price of the O/96?
I’m not sure what country you’re in, but if you can I would look into the Rosso Fiorentino Volterra. They are not as efficient as the other options you listed, but I have heard this speaker several times running off a 30w Mastersound tube amp, and it doesn’t have any issue powering those speakers, so your amp shouldn’t have any issues pairing with them. I think they fit your description very well. If you can find somewhere to audition them, they really are excellent and at a very similar price point to the O/96.
I’m not sure what country you’re in, but if you can I would look into the Rosso Fiorentino Volterra. They are not as efficient as the other options you listed, but I have heard this speaker several times running off a 30w Mastersound tube amp, and it doesn’t have any issue powering those speakers, so your amp shouldn’t have any issues pairing with them. I think they fit your description very well. If you can find somewhere to audition them, they really are excellent and at a very similar price point to the O/96.