I am trying to choose surrounds to match front rf-83's. Both are pricey for surrounds. There are several cheaper alternatives but I am not sure they are powerful enough to match the fronts. My center is an RC-3 which works fine even though it is not the perfect match for the 83's. My current surrounds are KSB 2.1, which is why I want to upgrade. My great room will only allow surrounds at each back corner of the couch. Any comments?