Semi, being a dealer for Usher, Plinius, and Bel Canto, I actually find Bel Canto to be warmer than Plinius. So, if the Plinius and BE-718's are a little too warm then Bel Canto will only make it warmer. In my room (which is a little more brightly balanced), a Plinius M-8 preamp and SA-201 power amp was a little bright with the BE-718's. Swapping to a Bel Canto PRe2 and REF1000 monos warmed up the sound to where it worked for me in my room. Likewise in a different system that was too warm and laid back with the Bel Canto, the Plinius combo worked extremely well.
Raks, the BE-718's can take a lot of power, so you don't have to worry about an amp with too much power. In my opinion, there is really no such thing. Use your ears. If you start to hear the sound breaking up a bit from overdriving the speakers, just turn the volume down. You're always safer having too much power than too little. I have driven the BE-718's a lot with Bel Canto REF1000 monos which put out 500W into 8 ohms. I've cranked up this combination considerably at times and have had no issues whatsoever. In the past I've even cranked up the REF1000's with Focal Micro Utopia BE's which are only rated for 100 watts and it was not a problem at all. There were times with the Micro's that I could hear them reaching their limits and turned it down. So, don't worry about having lots of power.
Raks, the BE-718's can take a lot of power, so you don't have to worry about an amp with too much power. In my opinion, there is really no such thing. Use your ears. If you start to hear the sound breaking up a bit from overdriving the speakers, just turn the volume down. You're always safer having too much power than too little. I have driven the BE-718's a lot with Bel Canto REF1000 monos which put out 500W into 8 ohms. I've cranked up this combination considerably at times and have had no issues whatsoever. In the past I've even cranked up the REF1000's with Focal Micro Utopia BE's which are only rated for 100 watts and it was not a problem at all. There were times with the Micro's that I could hear them reaching their limits and turned it down. So, don't worry about having lots of power.