I would rather the Nokia anyday running on S60 system.It's lovely because it can do all the functions you have specified with ease especially e52 and e75 models.You also get to install free software like Nimbuzz for chatting,Yahoo Mobile,Gmail Mobile etc ( I have a Nokia 5530,its great).
Go for Windows Mobile phones at your own risk.I once spent a week with Samsung Omnia running WM and I hated it.Its slow,complicated,very un-phone like and can easily get viruses....and when it does,you gotta buy the OS!Plus its hard to come by free software to run on it.
Formally employed people often live their employers' dream & forget about their own.