1. Brand. HTC Desire or Samsug Galaxy S I9000

2. I need function as following:
-Able to sync with my microsoft outlook
-Good calender organiser- appointment,meeting
-Good call quality
-Able to get best network signal( upset with iphone 3gs with weak signal and "could'nt connect to cellular data")
-Clear text and bright screen
-Long battery life( need to call a lot, not playing game)
-Able to serve as modem for PC to use internet service

Thanks for your suggestion.