I am planning to buy either a Yamaha RX-V650 or a 450 Receiver, but not sure what sort of speaker package I need to buy with it. Do I need to buy a speaker with a subwoofer included or do I just need to buy a set of speaker e.g. set of five that includes a centre speaker. If I need to buy with the subwoofer included, do I need a Active sub or a Passive sub. What I need is a good quality sound from my TV as well as watching movies from my DVD player. I am not an expert in this area so will appreciate some help from you experts. Thanks in advance.