I would get a 32GB if I were you, with all of the movies, apps, and songs out there you will definitely find yourself wanting more space. if you want to use it solely for music and browsing the nets, you could probably get by with 8GB. also, even though they are advertised as 8GB/16GB/32GB, my 8GB iPhone only has 6.2GB of usable space and my 32GB iTouch only has 28.5GB.
the 3rd and 4th generations of the itouch are great for a lot of things, but being fast isnt one of them. they play music/videos fine, but are super laggy when it comes to apps and typing things (at least mine/my friends'). if you want something faster get the newest one (5th gen).
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