C4D Studio is wonderful - and expensive. You need to use Poser Pro to work with it so it's still the double application thing; unless you want to re-reg the characters that is. C4D does offer some greater capabilities than Carrara but unless you are a career illustrator or animator, the difference in cost between C4D and C7Pro will never be made up for in advantages gained.

Seriously, most folks don't realize how wonderful Carrara is and feature sets that it has as compared to other products - especially for the price.