But I suck at marketing...
Then you'll be better off spending your time and money on that. Trying to fight piracy you could spend a lot of time, energy, and money, and still not make a dent. Concentrate on making a great game and making it as easy to find and purchase as possible. Pirates have no intention of buying your game so they aren't lost sales. I don't think I've heard of anyone ever saying "Man, I couldn't find a cracked version of [GAME NAME] so I bought it instead.".
If you do try DMCA Force though I'd be interested to hear about you experience. I don't mind being proven wrong.