Ron, I wouldn't replace your Palm with a PocketPC. I recently broke my iPaq 4700 and replaced with it a Palm T5. A much better unit, quick, reliable, easy to use. Cheaper, too at $499.
However, I do run a PocketPC PDA in my 4WD. The VGA models are definitely worth it, but in reality you could just as well run one of the older models like an iPaq 3800 which is no worth around $100, check out eBay, Trading Post etc. All you'd then need is the cable for around $100 again, see www.gpsoz.com.au. There are expensive mounts but mine is made of metal bent in a vice, angle-grinded and spray-painted matt black. So the PDA option need not cost a lot, especially as being a laptop owner you will already have electronic maps. OziCE is $40 I think.
