This depends on whether you want the pre-cut kits or the print-and-play (PnP) version.
If you want pre-cut kits then it would be the "Battle Starter Pack"tier ($50). As the paper-craft design is the "meat-and-potatoes" of this project's uniqueness, we would strongly recommend going for this option.
If you just want to play the game, and are happy to print, cut and glue the ships and warriors together, then you can go the "Print-and-Play game" tier ($10). As mentioned in the description the print and play versions of the ships and warriors are simplified versions of the pre-cut kits. The designs are compatible with each other however, so you can expanding you fleet size with PnP ships (hence the reason why all physical tiers include the PnP PDF).