The high def display is nice, but keep in mind what your goal is for using a Palm. I owned a Palm 3 for 5 years before I got my Tungsten T, and I've experimented with a lot of add on software. In the end, I use the basic apps (replaced with KeySuite due to the T's OS limitations); a photo album full of my kids; Documents to go, to sync a few docs between home and work. After 7 years of experimentation, those are all the applications that remain.
There is a good paragraph in DA's blog about implementing GTD, which is particularly relevant to handhelds.
I personally don't find working on a tiny handheld screen very easy. I rely on it as a reference tool, but I never edit documents or keep databases on it. For me, itís not a workspace. I could get by with a much lower end Palm. Determine your need, then choose your handheld.