Leon,
I use an 80G Hard-drive in a 'Noontec U235' external HDD case that Laurie sent me. I don't even save to the lappy any more. I save directly to the Mobile HDD. After imaging, I just plug the Mobile HDD into the pooter in the house and do my Processing.
Lappy stays nice and empty.
Case -
http://dma.net.au/index.php?action=d...oduct&pid=5352
I think you can buy the Noontec with HDD fitted, power supply, USB 2 lead etc, all ready to use for about $120.