Although I don't run any sort of custom script, nor do I pay for some company to host it, I believe my server is pretty decent. I use both /banip and /ban on anyone that griefs, save the map often, and usually only host it when I'm online, or when I know one of my trusted ops are on. To become an op, all you need to do is prove to me that you don't have your head shoved up your ass. That's about it.
Current Server: Ruins generated with omen with some nice little rivers that go through the mountains and ruins.
Picshure Tiem (lolimageshack)
Yeah, there's no griefing that isn't quickly fixed. Enjoy.
I changed it to a new map that I generated with the new version of Omen. (Ruins with some mountains.) And I added some water to it. Came out pretty nicely. And don't worry, I backed up the old map. (I always do.)