Thanks for the in-depth explanation! Yes i see what you mean about the drive pricing Its $200 over the 80gb (as you mentioned). How easy is it to upgrade these units yourself? Buy an 80gb unit and install your own 160gb drive and sell the 80gb drive?

I'd also have hoped they'd start using the 1.8'' drives to get these things even smaller (or use the extra space for batteries) but then I suppose there would be no 160gb model.

How cute is that 404? Probably too small for my needs. Yeah perhaps a 504 or a 604. To be honest, 30gb would do me fine (for now) and if I could upgrade myself later then all the better. A 604 would do me fine I think. The only difference I can see between it and the 504 (other than drive size) is that the 504 has 30mins more battery power (5hrs vs 5.5) and is 6mm thicker (17mm vs 23mm).