funny, i am using a Dell Latitude CPx with a PIII 700mhz processor and docking station. works great under WinXp Pro after adding some more memory into it to get it to 354mb!
that is dang cheap for that laptop. mine is valued at $560 after watching some ebay auctions on ones similar to mine, mostly cause the docking station is $75-$100 alone
also, the car adapter (DC to DC) for the older Dell's is NOT easy to find. Targus is the only one that still makes one for the old models like the CPx I have. Dell doesn't sell them anymore. really wanted one from APC, but they don't sell ones that have adapters for my old model.