What type is the best USB Wall charger to get? Note: I don't want it just for ipod and iphone, i would like it to be compatible with others, like Sansa, etc. Also, if it is available from a legit seller on Amazon or from Amazon itself, that would be even better. All the ones I have found on Amazon look fake and cheap. Of course, should be a good deal too. Any price up to 10 or 15 dollars is great. Thanks!