Krell Amps vs others

My question relates to the powering of speakers that can handle large power loads. Krell is often mentioned as quite good at pushing these type of speakers (ie Dynaudio). What other companies make equally powerful class A amps wih high output into 4 Ohm speakers. My sense is that my Dynaudio Contour 3.3 can take a heavy power load, even more than the 450wpc into 4 ohms they are currently getting from y existing amp.