The Touch is more advanced obviously then the Nano and Classic. Currently Touchs are going very cheap on eBay (300 AUS for 16GB new), so take that into account.
Wi-Fi is a huge advantage for the touch, over the Nano and Classic. Without Wi-Fi, it's still an excellent media player, and PDA (with all the applications currently being released). Has everything a Nano and Classic does, but larger and touch screen, applications, a few more tidbits (like the calculator and such).
It all comes down on what you want from a MP3 player, and the costs (keep in mind the September rumored events, and the current eBay prices, as they're starting to go back up again due to the school offer ending soon.)
Wi-Fi is a huge advantage for the touch, over the Nano and Classic. Without Wi-Fi, it's still an excellent media player, and PDA (with all the applications currently being released). Has everything a Nano and Classic does, but larger and touch screen, applications, a few more tidbits (like the calculator and such).
It all comes down on what you want from a MP3 player, and the costs (keep in mind the September rumored events, and the current eBay prices, as they're starting to go back up again due to the school offer ending soon.)