No problem - it's a good question, and one that hasn't even been asked yet.

I haven't taked to anyoe who's used the new Canon flash yet. But going by 550EX flash owner experience, and because of the new ETTL-2 metering, I'd go with the 580EX. I would be very surprised if any of the Metz units can take advantage of the new Canon flash metering. I expect that the 580EX is the only shoe flash that will really work correctly with it. Of course, if you're going to do mostly manual flash exposures, then it doesn't matter. But if you want to shoot in ETTL-2 flash mode, then I think the 580EX is the right thing to do. Plus, I would assume that the 580EX has IR wireless cabality, including compatibility with the ST-E2 Transmitter.

I think I still need to add the 580EX to the flash reviews. I'll try to get that done today. Then we should be able to get some reviews for it.