The best speakers in your price range for both hip/hop and rock, as well as movies, are the Klipsch RB-81ii's. These are some damn good bookshelves that put out a heck of a lot of bass and would run circles around the B&W 683's and the Polks. They are also bad to the bone for movies. For a center channel, I would recommend an RC-64ii. This will give you a world class setup that will stomp the heck out of ANY Polk speaker and pretty much every non-800 series (excluding the CM9 as well) from B&W. Before you decide to buy anything, go audition the Klipsch RB-81ii's as I can promise that you will walk out with them. You might also check ebay and a-gon in search of some used RB-81ii's and an RC-64ii. You should be able to pick up both the RB-81ii's and the RC-64ii's for well under $2,000.00. If you can't find any of those in used condition, then the original RB-81's and RC-64 are 90% as good as the second series. Good Luck my friend.