If all you want is music, do the zen micro.
I find that the Zune is superior to the Ipod video. Unless you got all your shit through Itunes. If you just got a bunch of MP3s and whatnot, Id definately get a zune. Better screen and video play back, FM radio tuner, and WMA support(smaller than MP3's so 700 songs becomes 1400)
So i'd convert your MP3s to WMA and get your ass a zune.