Need a new phone. Which one do I choose?

[Justin Pierce]

I am getting all into this social networking stuff. I need a phone that can do more.

Here's what I'd like my phone to do:
-Access the internet so I can pull up listings for homes I see for sale while I'm out.
-I need GPS to find home's address
-Stay connected to emails, twitter, myspace etc. while I'm out of office.
-I need a good schedule keeper callender thing
-Not much related to this site, but I'd like to be able to keep track of my workouts.

I know a lot of you are far more into twitter and facebook than I. Many of you are big tech geeks. I just started dabbling. So, geek, help a brotha out.

What do you suggest? Blackberry, iphone, palm and why.