And here is the third idea, which would work as a short story. I called it "Spare the Simple" but I never liked the title and it was just working title. It was about a Amish Family that suddenly notice that all of the "Modern" people have vanished, and set in motion a conflict between they're curiosity and they want to stay seperate from a sinful world. Or course this all climaxes with a trip into the city where they discover that all of the modern world has been destroyed by aliens that "Spared the simple" cause they where no threat to them.
If done right, that third idea sounds like it would be an awesome short story. You'll just have to figure out how first the Amish realize everyone's gone, then second, how they figure out the alien's intentions. Realize that as far as I know, Amish do live in areas and towns that have modern things like cars... there's a few Amish communities in the state and I've seen carts driving down the road alongside cars.
My own idea, eh? All right, only one other person knows about this.
Edit: Cliffnotes version
The story's set in the near future, so technology is similar to ours but slightly more advanced. The setting's in some country run by a puppet government and really manipulated by large monopolies and companies (not too different than today, actually).
The main character's a loner type of guy, not a lot of friends, doesn't remember much about his childhood. Has one friend who he crushes after. Around him wierd creatures are being spotted more and more, some dismiss them as hoaxes. Main character doesn't care until one of them kidnaps his friend. Suddenly some crooked cops are after him and one of them kill his father in front of him. He flips out and discovers he has telekenetic powers. He meets a stripper with similar powers who agrees to help him.
More and more of the creatures appear, resembling creatures in legends of old. A powerful religious organization uses the oppertunity to take over half the planet with a huge legion of followers. A resistance movement appears that the main characters join, but the main guy is reluctant to fight. He also has a tendancy to flip out and kill people who piss him off, none of this "scold them and send them to jail" crap. The main characters find out that the creatures are aliens who were caretakers of the earth, and their new leader wants to "reset" civilization. Also, the main characters (the guy, his crush, and the stripper, as well as others) find out they're really bioweapons created by the aliens that escaped. And so, humanity has to fight off the alien invasion, while they're not fighting amongst themselves.
I suck at cliffnotes.