I think that it should be worth it for you, if you're basically getting it for the fancier latest games. For me, of course, I'm just happy with the N900 and want nothing else (well, no, I want quite a lot, but I am happy with the N900), but I've played with iPhones, and while I find their screens to be slightly less precise than I got used to with the N900, for games designed to be played on the iStuff, it should be just fine.

I recommend Osmos as a game. If I had the spare money lying around, Osmos alone would be almost worth acquiring an iPod Touch.... maybe... I don't pay attention to iPod touch prices these days.

So that's my cent (not two... I don't have that many to contribute on this) on the matter. I haven't used the iPod Touch, and I've used occasionally but never owned iPhones... I feel that for what you're intending on using them for, they should be just fine.