Proslat ProCore Slatwall
Garage Slatwall
The Proslat ProCore is where the product line starts for me; instead of being made of 100% PVC, it has an extruded aluminum core that adds a lot of structural integrity. They have a clever design that hides the screws when you install them so they look seamless on the wall.
The Slatwall will come with everything you need to install; if you are looking at doing anything custom or covering an entire wall, you'll want to check out the additional trim pieces, specifically the H Trim.