Boy you opened a can of worms on this one since there are about a thousand different options. It comes down to air from the sides or air from the bottom. There is a mod with a can to prevent chocking with the air from the bottom if you go the silver..you can also mod the silver to perform like a gold by adding side air vents.
I went with the gold but you have to order it online i believe..at least i couldn't find it in the stores.
IMO the gold performs great with a charcoal basket because it gets air all around the charcoal and burns clean.