Since you just don't want them around because you are afraid you won't be able to restrain yourself, feel free to make your front door as unwelcome as you can make it. No more hints, tell.
1. Get a nice "no soliciting" sign from Home Depot and put it on your gate or front door. This protects you legally from what comes next.
2. Return all their mail, "retun to sender". Again, you can get a nice stamp from your local office supply store. Stamping is therapeutic anyways.
3. Post a Wicca decoration on your front door. http://www.13moons.com/index.php?main_page=index&cPath=101_272
4. Print about an inch of materials off the silentlambs site, put a big elastic around it, and put it by your front door. Put letter on top. "Do not come to my door again or I will sue you for ignoring my "no soliciting" sign. Your presence causes me great distress. Read the attached." If they knock, open the door, shove it in their hands, and close the door again.
5. Go have a hot bubble bath.