amp decision upgrade

im considering cinepro 3k6111 or ead powermaster 2000.my main speakers are meadowlark blue heron 2 and are currently driven by bryston6bsst rears are driven by cinepro2k64.thouhgts are biamp all three mains with 3k6111 or just the two fronts with the pm2000.would either of these be an improvement over the 6bsst.preamp is lexicon mc12b.i like loud rock music.i would appreciate your input.