should be the same. 8GB is sufficient, as I've seen screenshots that show a little over 7GB of storage.
Unless you like the super small size of the Nano (how can you watch stuff on it?!), you don't need to consider it if you're going for a Touch. The 8GB and 16GB are pretty much the same. Storage is the only thing affecting which on to buy.
Are you planning to use it just for music and Wi-Fi or do you plan to put videos/other stuff on it too? If so, the Touch will definitely have too little space for you. Your 6GB is kind of close. Me, I got the 16GB and put just about 4GB of my over 5GB music collection on it along with some music videos and movies. If you are a movie person, 8GB would be too small. 16GB is too small as well, so you'd probably want a larger PVP like an Archos or something like a Classic.
That's my thoughts anyway.
I am planning to buy iPOD touch 8GB this thanksgiving. I have about 6 GB of music that I usually listen to. Will the 8GB version be sufficient? (considering the other "goodies" and OS that come preinstalled on the touch).
Are there any significant differences in features between the 8GB and 16GB version or its just the space?
AND I heard/read - the iPod nano has better audio quality than "touch". Is that true? should I consider the nano as well? Though I plan to frequently use the wi-fi feature on touch.
Waiting for some suggestions.