Always go for a serum sunscreen. My favorite of the ones that Sephora offers is the Kate Summerville SPF 55 serum
Answered[ Edited ]
Ole Henricksen has an oil-free spf 50 sunscreen in their Truth line: Protect the Truth SPF 50+ Sunscreen
An option is NARS Pure Radiant Tinted Moisturizer. It is SPF 35, PA+++, and oil free. Anything over SPF 30 isn't anymore effective, so you don't necessarily have to pay more for a higher factor.