I wouldn't worry about blowing the speakers. I have the same bi-wired Kef 104.2s and have used a Bryton 4B NRB that puts out 250WPC into 8 ohms and 400WPC into 4 ohms. I've pushed the volume to ear-splitting levels without a problem.
In general, the better the amp, the less likelihood of clipping which would potentially damage your speakers.
In general, the better the amp, the less likelihood of clipping which would potentially damage your speakers.