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DVC 2-bedrooms are not the same as any of the signature suites (which are really nice but are different; for instance, no laundry). You could still do that comparison but know that it's not apples too apples. If you can find VGC cash rates that would be better, but that might be hard.
What I would do is compare with normal cash rooms (not suites).
Like, what would you book if you didn't have DVC? Maybe 2 or 3 rooms? Compare that--you'll still come out ahead and you have all the amenities of a 2BR like a kitchen and laundry!