I think for a first time user, get a 5500. They have a lot of support and aren't very expensive.
I got a 5600 at first and was very disappointed. I ended up switching over to a c860 and now I couldn't be happier. Eventually, go for that, but it's quite a price hike from the $200 I've seen the 5500's go for.
Agreed. 5500 is a great entry level.
If you easily have the extra cash and don't mind a bit more fiddling then the C860 won't dissappoint.
Just remmeber, these are both Pocket computers first and PDA second.
So if you invest a little time, you will find far more uses for the Z than any pda out there. However, If you take it out just for todo and calender then you will be missing most of the reason for owning one and should really consider a palm instead.
This site is PHENOMINAL. The people are a tremendous resource although they are sometimes too sketchy on the exact details of doing things IMHO (they are far brighte and resourceful than any group of "PDA" users around....many of these guys use the Z for Linux Admin, so that tells you something). However, Often times people will throw out program names and commands and leave it up to you to decipher. Followup questions ussually resolve the issue, but when you're in a hurry, you may not get the immediate feedback you want (well, it is a forum after all...not tech support) which can be a little frustrating.
But as time rolls by and you conquer a few issues (encoding movies to play or running a NES EMU) you will find that the curt answers make more and more sense.
Do yourself a favor and spend some time in the HOWTO section and it will help you tremendously, plus you will avoid re-asking worn out questions (which get the shortest replies )
Beyond the HOWTO, Offroad and the Admin gang have built a great site that most of us barely scratch the surface of. There is more here than you will probably need in a lifetime. That plus the people make this site unmatched.
Hope this helps.