Wyred 4 Sound or Peachtree audio

Hi,I am looking to buy a int.amp to drive my Magnepan 3.6's,I was looking at Peachtree & Wyred for sound as they both make int. amps with power from 700 to 1000 watts into 4 ohms.I am currently using Coda amp & preamp that is about 380 watts into 4 ohms. Will I hear a big difference in these amps compared to what I am using ? I am also using a McIntosh & Pioneer elite for transports into a peachtree I-dac for my digital end.I guess what I am trying to accomplish is to get more slam out of my maggies with less components.Are the newer class D amps as good sounding as a class a/b amp.I am open to any suggestions,thanks