Speakers for Rotel RSX-1057

I am trying to put together a 5.1 surround system to pair with my Rotel and my 65 inch Panasonic Vierra plasma. I found someone selling a KEF PSW3500 sub and wondered if I should pair that with KEF speakers, center, etc. I could also go in a different direction all together. My budget is $2000. Any suggestions would be appreciated.