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As others have stated, really depends on what you mean by big. I am currently the owner of a GSO 12" dob and reckon that in value for money terms they cannot be beat, under $1k and give you thousands oif objects to view. However in the commercial scope world (GSO, Meade, Skywatcher etc) of mass produced scopes the biggest are 16" so the term big dobs often refers to 18+" inches made by specialists such as SDM or Obsession.
As I am considering a big dob myself I have made contact with Peter from SDM and Dave Kreig from Obsession. Both I have found to be helpful and responsive to my queries. People I have come across who have their products are universal in singing their praises as far as the quality of their products.
Malcolm
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