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I'd like to reinforce what Mike said by saying that unless you are a super-human, starting imaging with a C11 at prime focus will almost certainly end in frustration and you'll sell the scope and go sailing or whatever you can do to get as far away as possible from Astronomy. I've seen it happen too many times. It's probably the single biggest killer of Astro-enthusiasm.
Get the C11, its a great scope and you will see heaps with it. But before you take on imaging, use a camera on it piggy back, then do the same through a small scope or telephoto lens and you will get good results quickly. This setup will allow you to get magazine quality images without pulling your hair out. You won't have to spend a fortune to get pictures (above the cost of the scope and DSLR ) This way you can guide through the C11 and image through something smaller on its back. 1000x easier! Also you will have a great visual scope and a good camera for day to day photos too.
When you have learnt all about imaging through 50 -500mm lenses/scopes you will know enough to take on the mighty C11 prime focus challenge.
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