This is what you do, at least what I know works the best.
Unless you have the stuff formally copyrighted (and it truely does not sound like you have), forget about lawyers, you won't recoup whatever it costs you, far from.
Take some screenshots and have someone else take a look at it so you actually have a few witnesses (some of those fuckers might change the files (and keep the filenames) and in worst case they could actually sue you for false claims.
Instead of sending a DMCA to his host you send it to his billing company. They are obliged to react (and they will). If the guy does not react soon (72 hours normally), the billing company will normally freeze the account and not process sign ups nor rebills.
If it's repeating infringement, they might actually close his account.
This is by far the most effective way to handle these bastards, as you might actually hurt their income if they don't react fast!
V