I have a friend who bought an Iphone and is utterly unhappy with it. It just doest have all that much to offer when you get right down to it, web browsing is really its big push. I would include the multimedia experience, but itunes is worthless to you unless you have already been using it for your ipod or as your multimedia player.
I chose the Blackberry 8310 yesterday mainly for the price (got it new for $60 from AT&T!) and the fact that if you ask anyone what a good smartphone is, almost exclusively they will answer 'BlackBerry'.
Its your decision but do some research into how many cool apps are available for each since it doesnt sound like your going to be doing a lot of internet tasks.