I have always been of the biggest is better school and up until the past few months a 17" MBP was my everyday laptop. Then a few months ago I had the opportunity to start using a 13" MBA for mostly just casual personal stuff. Mine is a 2010, 2gb with 256gb ssd.
Most of what I have to offer has already been said so just adding my confirmation.
By rationalizing what I really need on my laptop, adopting a cloud drive for my data (which I did anyway for backup and sync purposes), subscribing to iTunes match, etc, I have gotten to where the only laptop I use is the MBA, and I could not be happier. In fact, I sold the 17" when the retina's came out and Apple dropped the big MBP, figured it was a good time to capitalize on demand.
Of the 256gb of SSD, I only use about half for my regular data storage, so I have lots of free space to import movies, music, photos etc which only stay there temporarily until I export them to their permanent home on my network storage (or external HD, which ever works best for you).
Until I upgrade to a 2012 model, I do compromise by using iPhoto instead of Aperture, iMovie instead of FCP, just because the pro apps don't do very good with just 2gb ram, but it does not sound like these should be any consideration for your needs. Getting the external superdrive would be a requirement if you rip CD's. I store my music on a NAS but any external drive would do, once it is synced with iTunes Match you basically have access anywhere that you are connected to the internet. I am sure there are other options as well.
I don't know what else to mention that the others have not covered. The screen is beautiful, the whole computer is like a jewel. I keep mine in a portfolio style case but even wrapped up in that I marvel at the slim size each time I pick it up. Only my iPad seems to last as long on one batter charge.