Looking to buy an ipod touch for my parents. They only need 8-16 gigs as they are old people and don't have a ton of music. Whats the difference between the 2nd gen and the 3rd gen touch? If I can find a good deal on a 2nd gen, is it worth it? They aren't techies, just want to have some tunes to crank as they drive back from there florida winter home this spring. Thanks!