There's one thing to keep in mind. The moka pot's size is measured in cups, where one cup equals around 30 ml. However, if you purchase a moka pot with a capacity of 9 or 12 cups, you'll need to use a lot of coffee grounds each time (which puts the coffee at risk of being very concentrated). Start with a six or four cup model, and then decide if you need more.

I recommend getting a metal Venus, but there is also an aluminium version Moka Express for induction.