With the metz you will not have a problem registering it, I got my in the states, and registered in Germany. I know the canon will not give you a warranty in Austria.
Super Frequent Flyer, no joke. Ex Patriot and loving it.
Canon Eos 60D, T1i/500D, Eos1, Eos 630, Olympus EPL-1, and a part time Pentax K-X shooter.