Well, I'm not sure if this is the right forum but there doesn't seem to be an obvious choice.
I need to replace the floor joists in a shed because the old ones rotted out; the shed wasn't built high enough off the ground and dirt was allowed to wash under it and touch the joists. I'm raising the shed and replacing the floor and I was going to use pressure-treated joists but then I remembered how bad it can warp; I've seen pressure-treated posts rip right off of a porch. The shed's on a slight slope and will be 4 inches off the group at the closest point so the joists should never get wet. What's my best choice of wood for those joists?