My primary concerns are:
- not to have open it up and clean from dust. That's what all of my laptops, except Air, suffered from. They get dust inside and then get hot and loud. I move around a lot and it's inevitable. I don't want noise and I want as little heat as possible.
- Multitouch Trackpad like on Macbook Air. It's wonderful!
- Long battery life with moderate to high power cpu.
- Great 13" monitor that you can see what's going on in direct sunlight.
- As much as possible of internal fast storage.
- Lots of RAM.
- Great typing experience. I'm fine with chiklet on Air. It's just fine. I write a lot, more than typical programmers - treatments, instructions, screenplays on a daily basis.
Currently, only Air fits the bill, but it's getting old.
So, a high(er)-powered Air 13" with longer battery life and more RAM and disk space and better screen with updated CPU and graphics would be great. I haven't found one. I don't care which OS it runs. They're all the same these days.