i would have a blackberry. i had one before, althought without the data plan, but i would deffinately have a blackberry. but after having an iphone for over a year i cant see myself ever not having one!
If Android still existed it would probably be Android, but I wonder what Android would look like without the iPhone having gone there first. Android looks a lot more like iPhone OS than it does any other smartphone OS. Makes you go, "hmm".