Though making these kind of big-picture kind of decisions at the beginning of the process has been difficult for me and felt a bit unnatural at first, I think I'm learning to really like the idea. Taking the time to answer these questions - "What's your idea?", "What kind of book are you writing?", "What do you want to say?" - at the beginning, thoughtfully and thoroughly, is making me really analyse things and not just run ahead with an idea that's not as clear as I think it is. I think I'll be able to write a much stronger book because of it.
Asking for other people's opinions on my assorted summaries was an interesting experience. There was no consensus as to which type of story was the best or mose intriguing - in fact, I got one vote for each before I started to get any repeats. So there was no obvious answer, but everyone's reasons why they liked the ones they did, and their suggestions, were very helpful. In the end, #1 won with 3 votes. I was pleased with this because, based on other comments and my own ruminations, I had pretty much decided to go that route anyway, at least in tone and theme, while still pulling plot elements from some of the other summaries.
So - my genre will be urban fantasy, using magical elements such as shapechanging and vampirism in modern Reno. My tone/subgenre will be mythical.