Here's my thinking, my favorite cards are from the original Dixit. And because Dixit 3 also comes only with 84 cards (like the other Dixit games) and cause I hate their stupid scoring board system, I think you're still better off with the original Dixit. I think you'd be better off improvising with Dice or something for the voting using original Dixit.

Hm? With original Dixit, I would use the original voting chits supplied - they work perfectly well, much better than the stupid scoring board system with the peg that doesn't stay in the hole in Dixit 3.

With more than 6 people you'll need to improvise...giving all the additional players d12 dice would work....