Hi,
This page lists several expanders, tells a bit about what they do, what platforms they work with, and the costs. There are links to the web pages where they are sold so you can get more information.
http://home.earthlink.net/~agjon/list.htm
I use Shorthand (without the MedBrain part), and find that it works just fine for me. I needed something with a very small memory footprint, as the program I work in is a memory hog! It was also very easy to learn to use it. Otherwise I might have tried Instant Text, as it sounds just wonderful, and people who use it seem to love it -- it apparently has a somewhat longer learning curve, however.
I hope you find the list and web pages helpful.
