It's hard to say. I'd like to say one of hte Android phones except:
1. Would Android still exist w/o iPhone since it seems to try to replicate the experience? Honestly, I think even blackberry ahs some phones that may not exist because iPhone is what made some stuff popular.
2. I loathed the idea of a touch keyboard before the iphone. One of my requirements was I wanted a keyboard that at least was the length of the phone (didn't like thumb keyboards either). Almost ended up with some crappy phone that you don't even see any versions of today.
I may have gotten a Nokia instead. I was pretty partial to Nokia before I got my iPhone (mainly cause in my experience they made reliable phones that were durable as well).
If iPhone suddenly disappeared (or went to Sprint exclusively cause effectively for me same thing) so that I had had the iphone experience and the phone technology moved in the direction it already has, I'd say HTC Incredible.