I owned the Simaudio Moon I-5 for a little over a year. At times it was magic, but often I found it lean and a bit tizzy on the top end. This was the case even when running Sonus Faber Concertinos and ProAc Tablette 50 Signatures. The I-5 is quite dynamic for 70W per side, and it throws a very wide soundstage. Percussion sounded very lifelike and exciting, but female voices were thin and brass instruments could at times be a bit bright. I would think these weaknesses may be even more pronounced with your B&Ws.
I also had the opportunity to own the Electrocompaniet ECI-3. This integrated shared many of the same strengths as the I-5, but was also more forgiving. It was just as dynamic and soundstaged as well as the I-5, but presented more natural female vocals. I think the ECI-3 would be a good match with a broader range of speaker types than the I-5, but that obviously depends on the person's taste.
Other than those two amps, I haven't heard the others you're considering. But I have heard Plinius separates and liked their sound very much. Plus the 8200 would have the power edge over the Simaudio and the Electrocompaniet. However, if you can find an ECI-4 at a good price you might consider that.
Good luck and enjoy the search!
I also had the opportunity to own the Electrocompaniet ECI-3. This integrated shared many of the same strengths as the I-5, but was also more forgiving. It was just as dynamic and soundstaged as well as the I-5, but presented more natural female vocals. I think the ECI-3 would be a good match with a broader range of speaker types than the I-5, but that obviously depends on the person's taste.
Other than those two amps, I haven't heard the others you're considering. But I have heard Plinius separates and liked their sound very much. Plus the 8200 would have the power edge over the Simaudio and the Electrocompaniet. However, if you can find an ECI-4 at a good price you might consider that.
Good luck and enjoy the search!