Your opinions on what speakers to go with?

I listen mostly to rock, dance/trance, female vocals?

My system is comprised of Rogue Audio M150 Monoblocks, Rogue Audio Perseus Preamp, Consonance Turandot Player, and Monitor RS8's speakers.

I am looking to upgrade the speakers and I would like to know your opinions on what to go with (or what companies make a system that for the most part sound great with the music that I listen to).

My problem is when I raise the volume only to mid levels I start hearing distortion coming from the Monitors, as well as sounds mixing together (when they shouldn't). I like to listen to my music loud so please keep that in mind.

Please any suggestions would be greatly appreciated.

Regards
Tom