Not had a pro but had a Macbook air. Track pad is lovely and works brilliantly and build quality is superb. Didn't enjoy OSX at all. Apart form an Apple refurb AV Forums classifieds always has quite a few Macbooks.
What would you be using it for? 13" always seems a little small for Macbook pro for me, air or the new Macbook are more portable and can do most of what you want (although screen on the air is a little basic).
Yeah screen is much better on the pro..... Think the 13' would be fine tbh and it's already expensive enough so the 15' is out for the moment...pro beats the air on spec in most depts... Really just using for browsing ,,email,, buying over priced clothes etc etc.... Liking the fact I can integrate it with my phone and iPad aswell
Would say the only reason to have a Pro over the 13inch Air is if you're using graphics heavy stuff (Photoshop, video editing) or even watching lots of films. Stuff you're describing would be great on an Air, plus it's lighter, cheaper and better battery.