Old Question, any new responses? Logans and tubes

I would think the higher powered amps woule be a better choice;Manleys,vtl's,quicksilvers,and Audiovalve would be on my list.
I run Audiovalve Challanger 180's on my soundlab M2's with excellant results;what is nice with these amps is it allows tube mixing and matching as it is autobias.(el34,6550 and kt88 capable)a nice option for custom sound if you want to play.
I would think the SL3;s would be a good match at least on the panel portion.

The challanger amps I think start at 115 watts then progress to 180 watts triode power.
The manleys,vtl, and quicksilver amps I have seen average in the 90 watt range and then progress;there are models with lower power but I personally would not consider anything less than 100 watts to really drive and control the panel of the SL3;maybe a person with this speaker experience will respond to your post as I can only relate the my m2's which are a full range panel which would be similair to the logan cls speaker.

Lostbears named a amp I completely forgot about as I had cary Slam 100's on the m2's with 95 watts triode;excellant sound but just was not enough to really control the panel when volumn level was increased; although this is a very good amp;if you can find one with the ultralinear switch which increases power to 160 watts it would be a amp to consider;I also think going used gives you a lot more amp for the money and on resell you don't get beaten up to bad with the $$$$.