Depends entirely on what I'm doing with it. For my purposes, a Macbook Air just isn't enough. In a laptop, I want:
- A firewire port for an audio interface (I'm getting sick of using a USB interface).
- A quad core processor with hyperthreading for the many plugins I use (Logic and all the plugins in it benefit very heavily from having as many cores as possible, be they real or virtual courtesy of hyper threading).
- At least 8gb of RAM.
- 500gb + of internal storage (I don't want to increase my reliance on external drives).
- Dedicated graphics for the occasional game, now that I've sold my gaming desktop.
I love the Macbook Air. If my desires were a bit less demanding, or if I wanted two computers (desktop and notebook), I'd be all over it. But, that isn't the case right now. So, when the new 15" Pro is released, I'll be going with that.