Thanks everyone for your thoughtful inputs.
After reading @almarg @atmasphere and @jsautter I put my 300b Coincidents back on and played some music with a with great dynamic range. This song goes from 66dB to 98dB in 10 minutes and back down.
I thought my 8W amp was able to handle it quite well without running out of steam. I put my 200W SS (class D, Lyngdorf TDAI-3400), I liked the Coincidents better and it even had as good or better bass.
Perhaps like the cliche we always hear in mags, the quality of watts not quantity matter here.
@riaa, yes I remember Matt @ Pitch Perfect Audio used Shindo Cortese with O96, and Art Dudley used the Air Tight ATM-300R on the Devore O93 (lesser sensitivity that the O96s by 3).
Hence I rounded up these set of 300b amps as my final list.
Maybe they sound even better with PP tube amps, I have not tried that combo yet, so I will take that into account.
In the coming weeks I will try to get a home demo of the Nagra 300b and compare them with my Coincident 300b that should conclusively tell me if I need more watts.
@pah, wow! The Kondo Overture was in my shortlist as well. You are making me want to put it in the running as well.
@cal3713 , yes will keep this thread posted as developments occur. Think our journeys are quite similar.
@shkong78, I was considering getting Takatsuki 300b tubes, I heard with the Coincident Franks they are sublime. WE 300b for $6000 are simply insane, I won't even go there.