The Treo 300 looks pretty good to me, especially with Sprint's nationwide coverage. I'd love to combine two devices (phone and PDA) into one and add email and web.
Unfortunately, Handspring says they don't support Mac use (now). It also appears to use the obsolete Motorola Dragonball processor and does use Palm 3.5.x, not Palm 5 or the much faster processors soon to come.
Do Mac users have any hope with Handspring? Will iSync help, or is that just for Bluetooth devices? Anybody seen the screen on the Treo 300?