Smucker's Creamy Natural Peanut Butter
The gateway natural peanut butter, the brand I bought in college when I wanted to feel like I was doing my body good by eating peanut butter for dinner, Smucker's Natural Peanut Butter holds up well to these more "specialty" offerings, even if it doesn't surpass them. It's mostly peanuts, with a negligible amount of salt, and it's certainly on the thin side, but it makes for solid, guilt-free fuel for an all-nighter.
The gist: Here's a hint from my college self: try this stuff on a grilled peanut butter and jelly sandwich.
Price: $5 for a 16 oz. jar.