An Old Testament Space Opera.
Think 'Joseph and his Amazing Technicolour Spacesuit'. Has the advantage of a ready outlined plot; but by the same token it's a plot that has already been reworked a few times.
A DragonQuest prequel.
DragonQuest being NaNo 2009's comic fantasy retro-cyberpunk road trip. No plot ideas, but being silly always comes easier during NaNo than being sensible.
The Ballad of Matthew Smith.
Another comic cyber-fantasy which may or may not be related to DragonQuest, but relates the story of a computer programmer who is abducted and taken to the world he created for his best-selling game, for reasons as yet unknown...
The Nazarene Sect.
Not sure if this is a time travel story or an alternate history, but it's something timey-wimey and Christ's life on Earth forms a critical point.
All of the above.
Not strictly a novel, but a writing a collection of shorter stories would give me the chance to start any or all of these ideas, and more, and see which have the legs for a novel and give me plenty of raw material to work on over the next year.
None of the above.
Save my ideas for December and pluck some characters, a plot and maybe a few other things at random from the NaNoWriMo forums, mix them all together and create something entirely unexpected...
If it helps, they'll all end up in the broad genre of Christian sci-fi and fantasy, so vote for whichever you'd like Paeter to produce and audiobook of