The data transfer speed is a little bit misleading with these devices. The limiting factor for most of these phones is the processor power and operating system/web browsing software, not the data transfer speed.

For example, I have a Nokia 9300 on Cingular while my friend has a Verizon Treo 700W. When we are in an area where he gets EVDO reception (400-700 kbps) and I get EDGE reception (150-175 kbps), I can load most web pages quite a bit quicker than he can. His phone seems to stall on any kind of javascript or flash content, while my phone just loads the page nice and smoothly. So unless you are downloading large file attachments on your phone, don't get too happy over EVDO -- you may be disappointed. Most likely the 700P is only going to load web pages a tiny bit faster than the 650. It all depends on the operating system and if Palm improved the super-slow Blazer browser.