(moved to Skin & Bodycare)
Coppertone, Neutrogena, Avène, and La Roche-Posay all make pretty good sunscreens and are generally affordable. You don't need any more than SPF 50, and you would likely be fine with SPF 30, given there is only a one percent difference in protection between the two.
Are you looking for sunscreen for the face, body, or both?