Mostly web surfing, email, music and may start some home video editing. Nothing too demand.
My son's a theatre techy guy and does cad programs and puts his Pro thru its paces. We just do moble home computing stuff.
I like the Air's better battery life, lighter weight and solid state hard drive.
Put a SSD in a 5 year old mac mini we have and the change was huge. So I'm thinking the Air's SSD alone makes it a good bet. Although I did entertain getting an OWC SSD and 8 GB RAM and just upgrade the Pro. But that's probably 1/3 the cost of the new Air. And then the Pro's still 3-4 years old.
Thanks for your help.