I see a lot of people concerned about HD/SSD space. Why not use something like this? It's small and bus-powered and you can get it up to 500GB, Firewire400, USB, etc. You are using it on a desk most of the time so I don't see it as a real problem with HD space. I would be more interested in upgrading the RAM or a faster CPU. You can't get an external of either. If the MPA can be upgraded to 4GB and 2.4GHz, I would get one as a second laptop.