I am probably the stupidest Mac owner in the world, but here goes. I am looking into getting an Intel iMac, 20", yata yata. Do iMacs have built-in speakers? I only own Mac laptops (MBP 17", iBook G3), so I don't know anything about Mac desktops. If they DO, can I have some details. If they DON'T, which set of speakers would be nice for my new Mac?