Well, the fourth option isn't an option. If you invoke a planetary energy it's always going to be colored by the condition of the planet in your natal chart. In your place I'd check my chart for other planets in better shape -- the Sun, Jupiter and Venus are all good planets for workings meant to help a business prosper. Alternatively, if it has to be Mercury for some reaso, I'd look at doing another talisman with a different planet to help counter the negative side of your natal Mercury.