Firstly welcome to the forum Phil
You have obviously done your homework on what to expect you want to view and what is needed to achieve your outcome.
I agree with Iceman on his comments, and can recommend you only take one step at a time.
There are so many threads on various forums whereby so many budding astronomers purchase equipment that they rarely use or find for one reason or another to be impractical to use or not suit their expectations.
My advice is to start with something that is expandable, but basic, get a feeling for what you want to see, or expect to see and then add equipment as required to fulfill those expectations.
Ken M