Explody totems poison PF should be able to easily get all voidstones. It's cheap and has good damage but the clear is not amazing. A build that has good clear and can do ubers on low budget is kind of a meme and doesn't really exist.
Lightning arrow is great for mapping and can have decent single target but will require more investment. If you want to play a bow build I would recommend manaforged as it's more fun than a typical bow build in my opinion.