Grey Goose is a more expensive liquor that has a nice and smooth wheat flavor, making for a great espresso martini where the vodka flavor is there but not overwhelming.
Coming in at around $25, Belvedere provides a unique and smooth flavor with hints of almond and vanilla that work extremely well in an espresso martini.
St. George All Purpose starts with a non-GMO grain base and includes pear brandy. The combo comes together excellently with the coffee in an espresso martini.