Any good plated steel screw should last a long time.
If you do any reading about screws, you'll learn that Phillips head screws were designed to prevent excessive torque during assembly (ie the driver will slip out of the head) just like the clutch head screws in that Chevy used to use.. so if you are concerned about taking them out, cap head screws, or even slotted heads are a MUCH better choice than the Phillips.
