You don't mention budget, or sonic goals that you would like to achieve.
In order of preference (ims) I auditioned the following amps with my CS7.2s. Classe Omega Omicron (my current amp), Classe CAM 350s, McIntosh MC602, Mark Levinson 336, Krell FPB300, and Bryston 7B STs (my previous amp).
If you generally like your CA300 but want a more vivid, lively, and powerful presentation you couldn't go wrong with either the CAM350s or Omicron. The Omicron is more refined, fuller and richer, and noticeably more powerful sounding then the CAM350s.