I'm gonna start making deliveries for work and think its a good investment to get a GPS since I'm not to familiar w/ the areas I make deliveries to.

I'm not sure which one is the best and heard you can hook one up to a palm pilot. Anyone know anything bout them?

I have a handspring and looked into getting the plugin for it that has gps, but then after looking around, there are much better and cheaper ones that are standalones.
as for which is best - do you want it only in your car? then size and waterproof won't matter, nor will battery - but if you want it outside, then weight, size, battery, and materials will all matter.

Do you like the color or b&w ones better? Or is that just on preference?