Machka, you are lucky to seem to not need sunscreen. Everyone has to do what is right for their particular situation.
I have olive skin, I don't burn easily, but I never go out without sunscreen. It's not worth it to me to take that risk down the road. Skin cancers are no fun at all, and neither are wrinkles as far as I'm concerned. They sneak up on you all at once.
I've tried different brands of sunscreen until I found one that I like and that has the effective ingredients. It did take a while of testing, however. My preferred is Neutragena Sunblock and Paula's Choice moisturizer for oily skin with SPF 15.
Of course, taking a mid-day siesta does wonders for the skin, soul, and character of a person. Must be my Iberian roots talking. I can't get my boss to agree.