I think you've opened a can of hard drives here
For what it's worth I've been using all three varieties already mentioned (laptop, netbook and Rugged) for work. Just some personal experience:
Laptop - these are generally more rugged than people give them credit for BUT it depends what you mean by rugged - carting around in a car, I wouldn't be that concerned, but as an example of what can happen - I almost killed mine when working in Karumba. I was using it outside to record data (38 deg, 90+% humidity) and then working on it back in the nice airconditioned accommodation (25 deg, probably 20% humidity). After 3 days it wouldn't boot up. After much panic, thinking, telephone calls etc. I removed the hard drive and under the cover was a nice amount of condensation - no wonder the thing wouldn't boot. however, after drying it out it still worked (and still is).
Netbook - I've used a Dell mini-9 with solid state drive. I'm amazed how good these are BUT they are only a netbook. yes the keyboard is small and it has limited processing power, but it has no moving parts, not even a fan and low power consumption. If all you want is mapping and a bit of web/email at $500 they're great and you can use them to back up photos onto usb sticks, cd's or whatever.
Rugged - I love it and would have nothing else for what I use it for (nothing else would survive), but I wouldn't personally buy one for a road trip - too many $$ for a benefit you probably don't need.
It's going to come down to what you want to be able to do and how many $$ you want to spend - my advice would be think hard about the first part.
good luck!
Andy
2003 DIIa TD5
Oval Split level roof rack
DIY Storage system
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