I listen to a lot of rock with a high powered amp (Spectron Musician II) and Im very happy using a pair of Silverline La Folias. They are an 8 ohm speaker rated at 90db and will handle 1000 watts. They incorporate 4 great drivers Dynaudio Esotar tweeter, Dynaudio mid, ScanSpeak mid woofer and a rear firing Focal woofer. They go down to 22hz and can play really loud without strain when there is a lot of watts available (Bryston 14B-SST) to push them. They are equally enjoyable listening to vocals and classical. Good luck.
Jim
Jim