hey guys i just got my new mp3 player for my sweet 16! i chose the 30 GB nomad zen xtra over the 20 GB ipod (4th gen). so far i love the thing. i got like 70 cd's in it and have only broken like 2 and half gigs. did i make the right choice? it was 80 bucks cheaper. what are some things one can do but the other can't?