Need Smartphone Guidance

Hello.

After 5 great years of using my Palm Tungsten E2 PDA, I am ready to move on.  Actually, my PDA is ready for me to move on as it died.  I have been using GTD for at least 4 years.

I found the Palm calendar, memo, and task list to be perfectly simple for my implementation of GTD.  I also very much love the palm destop manager - no fluff, just what works for GTD.  (They won't let us install Outlook at work).  I know I sound very outdated!  I am truly a simpler-the-better kind of person.  In truth, the entry level PDA palm Z22 gives me everything I really need.

I am ready to move to a smartphone, and coincidently my wireless contract is up in August, so I am truly able to use any device.  I threw together a paper-based GTD system in the meantime - which in itself was a wonderful purging exercsie.

All that being said, any recomendations?  Treo, Blackberry, iphone?  Again, I want to keep it a simple as I can as I use this as my primary tool for GTD.  The desktop experience is just as important as the device for me too.  I live and die by the task manager function!

I appreciate any and all input!
Dave