Been a while since my first post because I haven't had much to update. We went shopping for backpacks today and ended up sticking with the choices we made a few months ago, both from Mountain Designs.
I have this one, the Columbus 65L:
Both packs open on the side (by that i mean they have a zipper so you can open them up like a suitcase and don't have to dig through from the top) and have detachable day packs, rain covers and infinite zippers, pockets and buckles. I'm going to have a play once exams are done to see if I can work out where everything goes... and will let you know what I think of it in more detail then.
Other things I've "invested in" for the trip- tripod, spare batteries and cases for video and still cameras.