It should tell you something how many of the crack berry users have had to get an iPhone.....
RIM is dead - iPhone or Android are the only sensible options.
OTB
I'm sorry but as a blackberry user I don't "have" to get an iPhone. That is what my laptop is for.
Reality is I will say it like this:
How often do you drop your phone/have it slip out of your pocket?
Are you in dusty or dirty environments?
Do you have an active lifestyle including during hours you would be carrying your phone?
The Torch bounces (first gen), as did the curve... MUCH better then any of the iPhones. Oh don't get me wrong... I like their apps but for that? That is why I have a laptop.
The Android phones are not bad overall... but lack that which I like about the blackberry.
In the end... You will do what suits your life best but please note that more than one person who used a blackberry, and switched to an iPhone are figuring their next won't be an iPhone if they are business users as it is too much of a play toy and not rugged enough for what they do.
Oh and one other key thing to note... iPhones have a touch sensitive screen. Sensitive to scratches... Blackberry has a HEAT sensitive screen. Much more resilient.