A martini, as God intended, is of course three parts dry gin and one part French vermouth, and anything drier than that is just a glass of iced gin. --Lucius Beebe, Gourmet Magazine Oct. 1948.
A true martini also needs really good gin, and the best gin I've ever had are two brand distilled in San Francisco: Junipero Gin & No. 209 Gin. Keep your eye out for them; they are both sublime. Balanced, bright, not overpoweringly piney, and really really smooth.