I have no clue what that post above me is about but i hope the effects are not permanent?
Blue Knight...I was in the same position as you when I bought mine. I did a lot of research and spoke to a lot of people with smart phones.
I ended up getting the 8310 Curve. It is tried and tested and seems to be a true workhorse. I also ride a lot have and have a Zumo 550 and I keep my phone on bluetooth in my saddlebag and it works beautifully with the 550.
I have never been a fan of apple because their products are so dam proprietary so my opinion on the i-phone is very biased. However I did question several folks who had one when I was doing my research.
I have been having my phone for several months and have never regretted it one minute.