There's not just one answer to this question (which is why having a great community is so awesome!). Your skin type, shade, and level of coverage are going to be the most important factors, but we can give you a few good options to start with. Giorgio Armani Face Fabric Foundation is a big crowd pleaser because it's buildable, great for photos, and comes in a better range of tones than most traditional foundations.
For lighter coverage, our office favorite is Sunday Riley Effortless Breathable Tinted Primer, because it looks like there's absolutely nothing on your face and makes a great base for concealer and blush.
And for great coverage that stays on all day, Bobbi Brown Skin Foundation is a longtime standby that people in the industry swear by.