* Do you prefer a pen or keyboard input? If its pen, your choices narrown considerably.
* What tasks do you envision using a PDA for? Again, these answers may point you to a particular device. If you need powerful math functions, the Newton and Zoomer aren't going to cut it (at least without third party software).
* What desktop computer do you use? The connectivity options can be important as you narrow your list down to a few choices. For example, the Zoomer does not yet have a connection kit for the Mac, although Palm Computing has announced they will offer one in early '94.
As far as how HP and Zeos compare to others, both units are miniature PC's. The HP100LX comes with a host of robust applications, and runs many DOS programs.
Units like the Psion S3a and Wizard 9000 series are not DOS units, but have some very user friendly features. The Wizard gives you a touch screen with the keyboard. The Psion is the most compact unit around, with a great set of applications, a very nice keyboard considering the size, and connectivity options for Mac and PC.
Let us know your anticipated needs, and we'll try to direct you toward the most appropriate options.
Merry Christmas,
Craig