Hi Alex,
to IceInSpace!
To start with, capturing planets versus capturing DSO's is a completely different kettle of fish. While some technical aspects and knowledge in processes crosses both boundaries, the type of scope you need, and the type of camera you need to do both, are/can be completely different.
So what i'm saying is, you may need to decide what it is you want to capture the most, and also, what your budget is.
Tell us more and keep asking questions!