It seems I can’t use it in Germany, apparently Germany uses GSM 1800 only, and the Treo uses 800/1900. Hopefully it will work in Prague.
Sauceruney: The Treo 180 is of course much cheaper than the 600, but it has some major usability flaws. You *must* use the stylus to navigate the system, which is annoying and makes it impossible to use one-handed. Looks like the 270/300 is the same way, but I’m not sure. Treo 600 fixes this problem, but it’s expensive. Of course, the Sidekicks avoid this problem, but lack the functionality of the Treo family.

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I can’t justify the expense of a treo 600 at the moment, but the 180 looks functional (and cheap) enough to play around with as a second phone.
As far as needing to use the stylus for navigation, would it be awkward if you improvised a thumb-mounted stylus?