I was debating between the 12" superdrive and the 15" but the price difference is much for me right now. Should I just wait and save until I have enough for the 15" or should I just go ahead and get the 12" as there might not be that much difference?
If you are not feeling handicapped with the 12'' screen, the smaller alubook is the better choice when the price matters. It's very small and robust. If you have a screen at home, you can plug it there and don't have to bother with the small lcd. One thing I should mention: the 12'' book gets warmer than the bigger ones.
My brother has the Rev. A alubook. And since that update, his fan is almost permanently working. I don't know if this was a good thing. The less heat costed more noise...