Thanks for the suggestions zigzag and vk2amv.....hmm, definitely will consider these.
However, this brings me to a more basic question.
How durable would any of these notebooks be when it came to frequent travel on rough terrain for hundreds of km at a time (road) ?
Also, could you suggest any precautions I could take to eliminate as much as possible the risk of the notebook I buy malfunctioning in the course of such usage (and travel!).
Thanks for your help so far, and any in future too!