Whoa! Thank you. I didn't expect to get so much feedback
I've noticed some of you are indeed big fans of Asus, yeah.
Well, what would be important to me, except what I've already said in my first post, is that the screen is not too small (Japanese characters are very small and detailed, so a big screen is convenient, say 3.8" or even 4").
Furthermore, dual slot seems nice to me. I don't know if it works like this but I want my software installed on the MC card (or internal memory, whatever) and keep my SD slot purely for data.
Also, I've been wondering if it's possible to have a 'multiboot' like I do with my desktop PC (say Windows Mobile 2003 US and JP on the same machine, with choice of OS at bootup).