Very basic question from a newbie... I have a Pioneer VSX-D509S receiver with bare wire speaker outputs. I'm currently using entry-level speakers which have spring clips to connect the bare wire. I want to upgrade my speakers so the question is this: Do I need to buy speakers with spring clips to connect my wires? Or, can I buy special wires that are bare on one end (to connect to the reciever) and have plugs or some other connector on the other end (to connect to the speakers)? Anything else to consider? Thanks.