Is Arc Audio really that good? I have been hearing the hype. I want to redo my system with all new top of the line stuff and Arc (not the KAR series) is on my list. Does it compare to the old Zapco stuff? Im wondering if it will be worth selling all my old equipment to do the upgrade. Looking for opinions from any Arc users. Im looking at a 4050 or 4150 and a 1500. Also, are there any online authorized Arc dealers?