For what it's worth, I was diagnosed 4 years ago with malignant melanoma. Fortunately, I had one of the top specialists in the world as my doctor (he teaches at UCSF), and I was cured (knock on wood) surgically.

My doctor made it absolutely clear that I should use a UVA/UVB sun block every day and never expose myself to the sun. I don't much care about what an anonymous Wikipedia entry says. I'll go by what my doctor says, particularly given that he is the one who teaches other oncological dermatologists.

My wife buys us Neutragena Ultra Sheer Dry-Touch Sunblock, which is SPF 100+.