So I recently won an iPod - 15G, I am psyched. The thing is, I want the 20G - partly because of the memory, partly because you get a case, and a remote, and a docking station as well. My question is - is it worth the hassle of exchanging it? My friends talk about restocking fees, shipping charges, general pain-in-the-ass - I'm not certain any of these apply (apart from the pain in the ass part). Can anyone give me advice?