I am looking for a good app to use as follows: I am going to be traveling and need to read/review and mark up (sometimes large) pdf and word docs. I would prefer to be able to do this on the iPad rather than carrying large stacks of paper, but I want something that will allow me to highlight and add comments (with a stylus and keyboard -- not sure which I prefer yet) easily without a lot of steps. Pen and paper is old school, but it's easy! I assume this is pretty basic stuff, but I have looked at all kinds of apps (Goodreader, iAnnotate, PDF Expert, Notability (which I bought, but doesn't seem to be working as I would like for the docs I am using) and now I am probably more confused than when I started. Experiences with these kinds of apps would be appreciated (and yes, I did search, but much of what I find deals more with note taking rather than reading and marking up documents for use on the iPad). Thanks.