I currently have a Sony TH55. While this has been a great device for me, I'm intrigued by the prospect of getting a single device for everything. It appears that these 2 devices are fairly matched in specs, with the exception of the screen.

Can anyone give me their opinions on a migration to the Treo 600; and if I should just wait for the GSM 650? I want to know if anyone misses the higher screen resolution or any other big differences. Thanks!