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All I'm going to say is, I bought a Touch and kept my old phone.
Then 3 months later I ended up buying an iPhone.
I did the exact same, basically the Touch has only wifi and to me while out and about it was bascially a exepensive ipod and served no real purpose, I wanted and ipod + wanted to go on the Internet wherever and whenever I wanted . When I had the Touch there was countless times when out and about, I said to myself "Wish I had a iPhone so I can look up this, do this etc".
I'm so glad I got an iPhone in the end