i-pod shuffle:
Storage: 1GB(240 songs)
Bat. life : up to 12hrs of music play bak
i-pod nano:
Storage: 4GB(1000 songs)....8 GB(2000)
Bat. life : upto 24hrs of music plybak and 5hrs of video
Display : 2-inch.
i-pod classic.
Storage: 80GB(20000 songs)...160GB(40000)
Bat. life :upto 40hrs of music ply bak and 7hrs of video
Display : 2.5inch.
charge tim : 4hrs
i-pod touch:
Storage: 8GB(1,750songs)..16GB(3,500)
Bat. lif : up2 22hrs of music plybak...5hrs of video
contains wi-fi and othr stf lik gravity sensor etc...
So u hfto considr stf acrdin to u n buy.....