Im like a little kid waiting for Christmas. My biggest problem is a popular one. Lens option.
1 Get the kit lens 24-105
2 Get the 24-70
3 Wait for e 24-70ii (will the difference really be worth the extra cost)
4 Would a 16-35 be useful for wedding shots in tight spaces
Looking forward to a whole new world of photography.
As you have no doubt discovered with your current setup, you can take really great photos with even the 18-55mm kit lens. I took some of my favourite photos with the original 300D (Digital Rebel) and the 18-55mm lens.
But getting one of the lenses you've listed will really help get the most out of the resolution of the 5D (any version). I really enjoy using the 24-70mm lens - it spends a lot of time on my 1V film camera and occasionally visits my 40D (it's not wide enough on the crop body). To counter this, I bought the 10-22mm lens for the 40D. This is the equivalent of the 16-35mm lens, which is why I mentioned it. That focal length is amazing for tight spaces, landscapes and cityscapes. While it's ideal for wedding group photos, you'd really want to avoid taking photos of people close-up with it, because it makes their facial features distort wildly. An 85mm prime is better for this (such as the Canon f/1.2 or the Sigma f/1.4).
The 24-70mm lens is very sharp in the centre, with some drop-off at the edges. It's very heavy - be warned - and the version 1 has an awkward 'reverse zoom' mechanism where the lens extends at 24mm and shrinks at 70mm. But despite that, it's a solid, bulletproof lens. I've used it in all sorts of weather and it's never missed a beat.
Version 2 of this lens is supposed to allow one to use some of the extra focussing points in the 5d3. I can't remember the specifics though. It's also lighter. Whether it's worth the significant extra outlay of cash, I seriously doubt it, but everything at the pro/semi-pro level from Canon seems to have increased in price recently.