I also tend to go for natural lips, especially because I tend to do more dramatic eyes - Burt's Bees chapstick is my staple for everyday. However, sometimes my natural lip color is actually a bit much in comparisson to my eyes, so I do tone them down a bit with a neutral lipstick.
My very favorite is Sephora metallic lipstick in #26. It's a sheerish, shiny honey color that works with my pale complection, and also works with the gold/yellow undertones in my skin, since I'm a natural blonde. My main priority for a lipstick is moisture, which is hard to find, so I was thrilled when I found this. It's only $10, and it's wonderful for the price. It also has a light, grape bubble yum kinda taste to it, so I like that.