I didn't see anything that could not be competently photographed with a 30D or 5D.
I appologize if the following comments don't fit your situation and current state of understanding but you've given us very little to go on so I'm shooting in the dark.
Get the 5D. It has the same user interface as the 30D you already have -- so you would have a first line and backup camera that are consistent in their usage. Your lenses will work on the 5D in the same manner they worked on your film camera -- no surprises. You also get the benefit of the crop factor on longer lenses if you use the 30D with that in mind.
If you shoot a lot of sports (and I just happened to miss that) and feel you need 8 fps then the 1D mkIIn makes sense for you.
I would strongly suggest that you look carefully at the processing end of digital photography. Namely: get a good quality monitor and the equipment to keep it calibrated. Invest in Photoshop CS2 and spend some time learning its "ins & outs". Perhaps a class or two in Photoshop wouldn't go amiss.
Assuming that you have existing Canon lenses, take a look at their age and pedigree. If you've had them for awhile or they were consumer lenses that got your business started, it may be time to replace them with higher quality "L" lenses.
Moving from film to digital can be a bit daunting. I've always felt that the best approach was to accept the fact that much of what you've learned with film will stand you in good stead with digitial AND that some of what you've learned with film will have to be re-learned from a different perspective when you move to digital.
Be humble and willing to learn from others' experience and all will go smoothly.
Best Wishes to you,
Ken
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aperture is a beautiful thing , it allows us to see the world we
live in !
hi , just wondered if anyone could point me in the right direstion
for which pro digi slr to buy & why !
cheers simon edward smith
http://www.perfect-imagesprophotos.co.uk
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http://www.ksgraphicart.com