Can anyone offer advice on my 4.1 vs 5.1 issue? I watch all my dvds on my home system (onkyo m/s m&k), I love my games & music. I have an audigy de & currently run boston 7500Gs which is a great combo up until THE point of distortion. I need more grunt & can save AU$300 going with Z560 vs Z680. I have not experienced 5.1 PC & am happy with 4.1. I love my toys so will fork out if I have to for the big gun Logitechs. What do you reckon??