Has anyone A/B's the 265-LS vs the 265-RT's? This system has LSiM 703's up front, a 704c center and 80FX-LS in-ceiling surround speakers. I have a 200x5 amp running these speakers but I'm out of external amp channels to run the surround rears. I'll be powering them with 125 watt Marantz SR-7008 receiver power.

Are the LS in-walls night and day vs the RT series? If I need another amp I guess I could figure out a place to put it in the rack to power the 265-LS. I guess my question is at almost twice the price and using receiver power should I step up and buy the LS surround rears?