I know this is a super old thread but I have to chime in here in case someone is still looking for information on these old girls. The Simaudio Celeste 4150SE is built like a tank. Very musical, smooth and tons of bass punch if you feed it with quality equipment and recordings.
I have just put one in my garage system and am seriously thinking of bringing it in to the listening room and replacing my Moon 400M Monoblocks. It sounds that good.
I have not heard a Krell but have owned lots of Bryston products and consider the Celeste an equal to Bryston in all aspects except warranty. Can't beat Bryston for service or warranty.