One-handed navigation
Thinking about this some more, seeing that you have difficulties with hand control, I strongly recommend getting a recent PalmOS model offering one-handed navigation. This way you can use the D-pad to control many applications and you don't have to use the stylus that much.
The Zire72 does not have one-handed navigation, but I believe all later models do. I know the Tungsten E|2, TX and Lifedrive all have one-handed nav. The T|5 I'm not sure about.
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