When I was looking into buying a cello, I found that there seemed to be different classifications for cellos beyond size (1/2, 3/4, full, etc). For example, some cellos were being called "Stradivarius models," and there was a wide type with a darker timbre whose name I've forgotten- it had a wider body and didn't fit in my case. But the point is, what other models are there? How does the model affect the sound?
(edit for clarification: by model, I mean the shape of a cello, rather than any brand/production name.)