I've been thinking about upgrading my Generation 2 iPod and have been getting more interested in the iPod Touch. Anyone have one? What are the ups and downs of one? My main concern is scratching up the face of the thing. I'd like the 18GB one right now but is it worth waiting for a bigger one? The one I have now is 20GB but I barely used half the space. Granted my G2 iPod can't handle videos but is it really worth it spending an extra $100 for an 18GB iPod Touch? I do like the instant iTunes capabilities but don't I have to back up the songs I buy on iTunes on a computer anyways? Or does iTunes plan on providing an online database for its users where it's possible to back up the songs online instead of it being on a hard drive?