I am debating between two contractors and two doors to replace a walk out basement door that leads to a storage area. Aesthetics are not an issue, we just want a solid, plain windowless door and it gets very little traffic, though we do occasionally take the bikes in and out there. This is an older 1962 house. One contractor only does Provia, and the fiberglass is above our budget, but they will do a 20 gauge steel. The other with do a ThermaTru fiberglass for about the same price. Mostly I'm debating durability/maintenance, as we tend to go a long time between paint jobs. The Provia steel comes pre-painted in the factory and seems like a quality door, but I understand that steel can eventually rust and dent. The ThermaTru fiberglass needs to be painted and, I assume, maintained more. I'm also wondering whether we could get away with a simple Home Depot door (knowing we'd need to keep it painted). The opening is nonstandard. Thanks.