The more power the better
After extensive auditioning in my own system - not reading reviews or listening to old wives tales - I am in the camp that believes the more power the better with your Logans. I used to have a Bryston 4B ST driving Ascents and Vantages. They really get a full control of the speaker, and produce beautiful music. To me, it is the best deal one can get starting out. Overall, the 4B ST is a great entry level speaker and the best value.
Eventually, you can bi-amp the Bryston with something like tubed BAt Vk 55 for pure heaven.
At the higher level, the 14B SST has some of the best measurements around, and it is preferred by those who love the hard, clean, detailed sound over just about anything. Then, there's the 28B SST to drive anything...
I eventually moved to the SS CJ 350 after auditioning a dozen tube and other SS amps. I found the tube amps more musical than Bryston, but they sounded fake and euphonic to me, with somewhat anemic bass. Some of the other more expensive, high powered SS amps have the same control of the speaker as the Bryston, but are more musical. The CJ 350 was the best of both worlds, bringing tube and SS virtues into one product.