Hello, this is my first post here. I've been lurking for a while and decided this it was about time to speak up.
If you go with a mini-itx board instead of a laptop and plan on running classic software with UAE, a single core atom might not cut it. I have no experience with AROS but i have run e-uae on my ubuntu netbook, some things seem to start out ok, but eventually the audio and frame rate drop.
I also have a mini-itx dual core ion based system (also ubuntu and e-uae), it runs games fine. I have no idea how uae works in AROS but i thought this might be useful information.
Another thing to keep in mind, as far as i know the newer Atom boards with intel chipsets only support vga out. The nvidia ion based boards have vga+dvi+hdmi so you'll have more options.
I agree that a laptop board is the best option as far as space, heat and processor are concerned.
Hope i got that right:lol:
Merry Christmas!