I'm new to this forum and this topic in general. Recently stumbled into some extra money and was wondering which if my options made more sense. I've got two pair of speakers, both cambridge - the ensemble and the ensemble IV. I'm presently using them on computers at home and at work. I was wondering whether I should spend $500 - $600 on a fancy receiver and center channel speaker and use the cambridge's for front and back or just buy one of the happy boxed sets? The cambridges have different impedences (6 and 8 ohms) and unpowered subs but aren't bad by my ear. If I go the all in one route, what would you nice people recommend? I'd also like to be able to hook my PS2 up the system with the fancy optical cable if possible at my price range.