Its going to be pretty basic stuff: web, email, light photo and vid editing, light web programming. I always hoped I can play Starcraft 2. But I would have very limited time for game, if i can have any time at all.
For the Pro, I am going after the regular display. I have the impression that I can upgrade the RAM and HDD, while I can't do neither with the Air. I guess the ability to upgrade component may extend the service life of the machine if its called for.
And the Pro is a slightly faster machine (processing power-wise).
Either way, I would mostly use the laptop around the house and it will see very limited outdoor useage except for travel maybe twice a year.