I'm thinking of giving up Blackberry?

[SUN]

I'm interested in hearing people's thoughts are about moving off of Blackberry and on to iOS, Android, or even the new Windows mobile OS.

I know it all depends on what I do on my phone, so here's my usage pattern. Heavy on email, calendar, and web browsing. Not so big on SMS. Probably on Facebook & Twitter only once a month (if that), and don't have many apps. I also believe that my usage pattern is influenced by the limited capabilities on my blackberry, afterall it's considered a corporate device. But I have also been noticing a lot of colleagues using iOS or Android, so Blackberry seems to be losing ground on the corporate scene too. RIM's recent guidance correction and planned layoffs is probably indicative of their loss of market share.

Blackberry just doesn't seem to be able to catch up with the pace of iOS or Android. So any thoughts of which other platform to move to? Any specific devices? My current contract is about to expire, and I'm using this opportunity to move to another device, just don't know which one.
Thank you very much to those who have responded. Any suggestions in terms of android device? As for the iPhone, is it worth waiting for iPhone 5?