Probably quite a bit, since the die would be computer created instead of plaster hand sculpted... the material option I have is: ALUMINUM, NICODIUM, BRONZE, COPPER, NICKEL
The options I have for the most expensive one are: ANTIQUE BRONZE, SHINY BRASS, ANTIQUE NICKEL, SHINY NICKEL, ANTIQUE COPPER OR SHINY COPPER COIN
What material would you prefer ?
Definitely not: aluminum
I (and i think most) want a heavy coin, a coin with mass. Not light like made by casascius. A bold, attention grabbing thing to put on display.
shiny copper is good, antique copper is better. antique nickel is also a good bet.
If you do shiny nickel, you must use the same mint as last time, since coins will be same color. I think it could go very well.
To be quite honest, I would consider the Shiny nickel and use the same mint the coins would then be the same except for different metal and compliment each other well.
I say antique broze OR antique copper OR shiny nickel