Finding a new foundation is a lot like finding a new lover — both require time, little tests, and trials of commitment. So when several new formulas launched this fall, senior market editor Diana Tsui and I decided to do a little round of foundation speed-dating: We would each test the same eight foundations in different shades, and record our results. (We both have oily skin; Diana’s complexion resembles Liu Wen’s, while my skin color looks more like Kerry Washington’s.) We tried the new selections from Tom Ford, YSL, Maybelline, Clé de Peau, Laura Mercier, Dolce & Gabbana, Lancôme, and Kevyn Aucoin, each of which offer different variations of skin-evening formulas that provide medium to full coverage for a range of skin types. Click through the slideshow for our take on the latest foundations — and how to pick the best one for your skin.