I am looking at replacing my old B&W front speakers with floorstanding speakers and was wondering if the Wharfedale Diamond 8.4 speakers would combine well with a Yamaha RX-V450 receiver. May only concern is that the rated sensitivity level of these speakers are a bit low(86DB) There are other speakers that I am really interested in, but they have no local distributors in South Africa. A prime example would be Cervin Vega. Speaker makes available are B&W, Wharfedale, Monitor Audio, Boston Accoustics, Mission. Any advise?