As far as the use of "would" is concerned, I can't answer you from a grammatical point of view, only usage. When asking people for their opinion, we frequently say:
What would your top 10 films be?
Who would your 10 favourite designers be?
I think it's somehow related to the fact that an alternative question is:
If I asked you what your top 10 films are, what would you say?
However, I'm sure someone else will be able to give you a far more technical response!
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