Given those choices I would go with the Rumble 200 combo. Eminence has outdone themselves with their newly designed 15" woofer for Fender, and is getting rave reviews. Many folks are snatching Rumble 115 cabinets because they sound so good and only cost $300. The Rumble 200 combo uses the exact same woofer and is expandable in that there is a powered extension speaker output jack. So you could run the combo on top of a 115 cab should you so desire. A Rumble 500 head on top of a pair of Rumble 115 cabinets would be killer.