I love Guerlain, especially their Rouge G de Guerlain lipsticks. My current favourite is number 68 "Gigi".
It's a hot fuchsia color and I think this color looks amazing on me. It's a quite matte color and very pigmented. The lipstick stays on quite well and looks best when it wears off a bit. See some swatches here.
Only bad thing about it is definitely the price: Around $45 in the U.S and 38€ in France. Very expensive for a lipstick! Mine is almost finished. Please let me know if you find any cheaper alternatives.