Hi,
See my response above regarding Final Cut Express. While it likely responds better than past MBA versions I would highly recommend you consider the 'brick' instead. Don't get me wrong, I LOVE my new MBA but my needs are very different than yours......mainly MSOffice, some simple photo editing, watching vids and some very light vid editing every so often. Yes I wish it had more power.....but it is so dang light and sleek!
I tried the netbook thing for a while and would say 13 is the minimum screen for me and they are just way underpowered especially for the Windows OS. The new MBA which costs 5-6 times more is a much better fit for me.
I just sold my MBA 13 because for heavy movie and image processing I use my PC desktop (anabolic steroid version) which has more than enough power. I will likely replace the Dell when Apple revises the iMACs.
Joe