Or, As the poster has mentioned, that the books are available as secure MS Lit, he coud go the convert lit route and get the sony.
Sorry, I just had to answer and and to the confusion by rounding off the recommendations
Seriously, Either the Cybook Gen 3 or the Sony PRS 505 would probably do if you are outside the US, but keep in mind that the Sony warranty is only supported in the US & Canada, So if something goes wrong, they will only ship it back to a US address.
Gen 3 Is supported internationally. And if Amazon get the books for the kindle, they should probably soon appear for the Mobipocket store, so you can avoid the need to strip the DRM and reconvert it f you want to in the future