I would buy a 5D Mark II and get either the 580 or 600 flash (I just ordered the 600 yesterday). You will certainly need the 24-70L zoom lens, which is why I recommend the 5D Mk II.
Thanks a lot, that's sounds like good advice, esp. since there are used 5d2 bodies around. The most interesting thing to me is that even in a Canon enthusiast's forum, no one is advising the 5d3 for this purpose, even though it certainly has one or two nice features. But since the af point expansion seems to be too slow, it would be single point shooting - and this seems to be ok on the 5d2, and I've been shooting "focus & recompose" for my whole life.
and I would strongly encourage you to get a 50mm lens for the 60D and USE it. 50mm on a crop body is 80mm. Or, you could get an 85 f/1.8 to use on both cameras. It depends on your style of wedding shooting. I prefer a photojournalistic type approach more, but I would take 3 primes and the zoom lens, 2 cameras, and the flash.
* Zoom: I'm not sure what 24-70 to get, though: The Tamron is a bargain esp. if backed up by good primes for important iq shots, the Canon 24-70mk1 is still rather expensive too, but the 24-70mk2 might be overkill for my purposes!?
* Prime: I already have the 100/2.8L macro, so I guess a 85mm would be too much of a duplication. If I'm really shooting w/ two bodies, a fast prime on the 60d sounds plausible for shooting available light and not pushing iso too high, and otherwise I've got the older 430ex2 to put on the 60d. Originally I thought about a 35L as my prime, but since you advise a 50mm - what "3 primes" do you use?
If you have any more questions please keep asking because there a LOT of people on here who do or did weddings. As long as you have the equipment described above and you know how to use that equipment, AND you get the exposures correct, you will be taking some awesome wedding photos! Good luck.
Thanks :-)) ... I'm not in a great hurry, I'll get the gear and get to know it extensively before I'd ask money for shooting, but I hope and think I can do it. The most important thing for me will be further learning now, and not going over the top with expensive gear.