Looking to buy a few more klipsch speakers to round out an entry-mid level 5.1 setup. The room is around 16x22 with a 250w 12" Hsu research sub. I'm thinking about moving the KG 2s to surround speakers and getting a center ch speaker that matches the fronts.. I've been looking into something from the reference or heritage line, though I'm not sure if the receiver is powerful enough (90w per ch) to drive a set of Heresy II's, for example. Thoughts?