I have bought most of my stuff online but for some reason I have always got my head units at authorized retailers.Authorized dealer certainly; if you can afford it. I got mine of fleabay and was happy with the transaction. It came with the iPod cable as well. That being said; I'm SOL if it craps out.
A LOT of people buy from woofersect, myself spending quite a bit with them as well. I have never, not once, had an issue with them. Their customer service is excellent, I even had them call me about 3 hours after placing an order via internet, asking me about a color option, 2 hours later it was shipped out. Beware of dealercostcaraudio.com. I have had awful experiances with them and I'm convenced that they may only have 25% of their items in stock, the rest of the time I think their inventory comes off of ebay after an order is placed. I bought 4 items from them, 2 different orders, they shipped out half the order and had to wait 2 weeks for the other half. Then on the second order I had to wait 2 weeks for one half and then another week for the other half. Awful customer service.I've been wondering that. Is woofersetc a pretty common place for people around here to buy their gear from?