Well, bookshelfs and a sub will do hip hop music fine. Its just you might be bassless until you buy the subwoofer.
I have never heard the 600's, or any B&W for that matter. Other good companys for bookshelfs are Axiom(bassless), BIC(will have the bass your looking for until you get a sub), Energy(sale with their Conusseir line), PSB just ot name a few.
SheepStar