Hi, I'm after a bit of advice. My Videologic Digitheatre died on me last week so its time for an upgrade. I'm thinking of getting the Marantz SR4300 amp, but I really havn't got a clue about speakers. I would like to get the full 6.1 system. Could someone give me a few suggestions on what to look for. I have a budget of around 600 to spend. Thanks.