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Lots of problems reported with the 650 - you may want to look at my rant at -
http://www.pdabuzz.com/Discussions/tabid/55/forumid/3/postid/29/view/topic/Default.aspx
and take a cruise around Pa1mOne's own Support Forum site -
http://forums.palmone.com/pe/index.jsp
(for example) before deciding one way or another. Lots out there elsewhere on the net, too..
I get the certain advantage of an all-in-one PDA and phone, but I worry that if (or when) something kacks on either the phone or PDA side and the unit has to be sent for repair, you're without both devices. Means more dongly bits fillng your pockets, but I think I prefer to have separate bits of hardware. In my situation, if the PDA had Wi-Fi I'd find that more useful (and cheaper to use) than an all-in-one wireless.
As you may gather from my rant, I haven't found anything to replace my PDA from the most recent offerings from Palm - so I can't offer any guidance there.
Good luck!