SET amp comparable to First Watt SIT 1?

Audiopax Model 88 utilize the KT 88 tubes and is an exotic and more complicated design than the very simple circuit of a 300b SET amplifier. The Audiopax was very well regarded but its talented Brazilian designer/builder died several years ago. This would be a rare find on the used market.
Charles

Is an SET design really necessary? I have a VAC amp that uses 2 300b's per channel, and it drives just about anything. I had it on a pair of ESL's for over 2 years and had absolutely no problems. 

You can also get a Wyetech Labs SET Sapphire 300B monoblocks with plenty of power to drive your speakers [ 18 watts RMS ] It's also on sale now at $7800 a pair

Thank you so much for the precious comments again.

Regarding the rooms size, my rooms size is 15ft x 30ft, ceiling is 8-10 ft (room is a bit irregular), and listening position is about 10-12 ft (3m) from the speakers. I mostly listen to jazz, classical (piano, chamber) and vocal. I usually do not listen to orchestral or rock, but I’m afraid that my current normal listening level would probably be a bit louder than the other SET people, considering the level that the SET exhibitors play at the audio show. It is definitely louder than Audio Note demos, but not loud as those loud solid state demo rooms. I start wondering if 300B SET is really powerful enough for my propose, since several people mentioned it... I also wonder if 100dB or 105dB speakers make a big difference.

Hi tmare,
You have a generous size listening room. You’re beginning to express some concerns. Why don’t you call Volti and talk with the builder himself? Parallel SET 300b, 845 or 211 SETs are options. Ask the builder his thoughts regarding OTL amplifiers as well. Discussion with him is a good starting point in my opinion.  Man oh man,  you have wonderful options. 
Charles