Those two netbooks look very tasty indeed, especially for under $400. Especially the LT3103, as that fulfils all the requirements I need apart from the screen.
I've just drawn out the size of the 12" models and it's almost exactly the same size as my current Dell X1, which I'm trying to shrink down.

I just need something I can tuck away in my hand luggage when travelling so that I can get on the net easily (even if there are some limitations in screensize). Most of the time my iPhone does as the browser is pretty good and there is a RDP implementation which lets me connect to remote PCs should something go wrong.
I have a feeling I'm asking too much to get a netbook that meets my ideal specs, so I'm going to have to compromise on power and get a little 10" (maybe even 9" if they don't have silly bezels all the way round the screen). That way it's so small I don't need to find space for it, but it will do everything required of it as a last resort (as I don't think working on a tiny screen would be fun).