matthewpiano said:
I'd suggest giving the Rega Elicit-R a good listen. Rega/KEF is an excellent combination and the Elicit-R is an outstanding amp which really grips and controls even challenging speakers like B&W CM10s. With your KEFs it should sound divine. The other option I'd be tempted to hear would be the Creek Evolution 100A, but also a Sugden A21a.
I am sure my new amp must be at least 150 plus watts per channel
You do not need 150W per channel unless you are trying to blow your windows out! My Marantz is rated at 70W per channel and my room is a 1000 sq ft loft apartment with double height ceilings. I have never turned the amp up above 12 o'clock and at that the room shakes. I have not heard any evidence of clipping or other distortion.
Find a dealer who will let you listen to a range of amplifiers and buy the one that sounds best irrespective of brand, price or specification. If possible get him/her to switch the source cables without telling you what he/she has done and then judge which is best. Then you won't be influenced as we all are by extraneous perceptions.
Chris