For a while I used a little Sony Viao (and still do occasionally) which was great in terms of size and weight with a CF card adaptor. Unfortunately the quality of the screen was totally unsuited for serious editing, and I've yet to see a small laptop that would do the job. There are some lovely models out there with excellent 17 in screens, but this rather defeats the portability issue.
In your situation, I'd go for the small laptop which will meet most of your needs, but leave critical editing and A.net uploads til you get home.
I would also seriously consider incorporating a CD
burner - lets face it, all manner of disasters could befall the laptop ... it would be nice to know that all those images are safely stored on CDs.
Colin K. Work, Pixstel