I do rely quite a bit on my guidebooks so it's probably better to take the paper versions as you suggest. I was really hoping that I wouldn't have to carry around so many guidebooks but I guess I'll be saving at least a little bit of room by not hauling novels with me everywhere I go. I'm planning on going to Australia, New Zealand, Fiji, India, Egypt, Syria, Jordan, and Israel so that's a whole lot of guidebooks to lug around for 6 months! A friend will be travelling with me though so at least we'll be able to share the burden.
Thanks for all the feedback!