I recommend BLACKBERRY or TREO 600/650
The only reason I am selling the Blackberry is because I work for Canada's largest Cellular Phone Company (ROGERS) & I have a SIM card issued to me by ROGERS which gives me UNLIMITED DATA & VOICE for FREE!!!!
I bought the Blackberry on EBAY, only after I got it did I relaize that the UNLIMITED DATA I have on my SIM card is good for any GSM device EXCEPT BLACKBERRY....
It seems BLACKBERRY's require a special 'BLACKBERRY DATA' but they have the best technology for emails etc etc......
I wasnt about to pay for the 'BLACKBERRY DATA' when I have all other type of DATA for Free....
SO I am now shopping for a treo 600/650.
BUT I THINK BLACKBERRY IS THE BEST, then Treo a strong second....
ROGERS SELLS 'UNLIMITED DATA' on the blackberry for about 45$ a MONTH, USD. Then you choose whatever voice plan you want on top of that aswell.....
I get it all free though, just cannot use the DATA on the blackberry which is why I am selling it....