NaNoWriMo 2011 Which Genre to Write?

I've been in a quandary about which genre to choose for 2011's November NaNoWriMo.

I've tried the Young Adult category before, and I enjoyed that but I feel the need for something meatier.  I wrote a Memoir last year, even though that is not a "fiction novel" genre, I think a fictionalized memoir is almost a requirement in order to protect one's self from libel, so I "fictionalized" it up quite a bit.
Bannack Montana Livery Stable

Today I have been toying with some ideas for a Western.  It doesn't seem like a genre that is particularly commercial in 2011.  I base that in part on the numbers of Western novels I see promoted on various web sites and best seller lists, and on current Western movies.  Wow.  There just aren't any. (There is True Grit but that was a re-make.)

I think I may be able to write a story that could be set in either the late 19th century or in contemporary times.  A story is a story, after all, and if I leave out quick draw gunfights and cattle rustling, perhaps all I have to do is add cell phones. Then my cowboy story might be happening here in the 21st century.  Come to think of it, out here in the West we still have cattle rustling and a gunfight or two on Saturday night.  I might be able to have some fun with this.

I will be working on characters and plot before the November first starting date, which may or may not be allowed.  I need to have a starting point.  Thankfully, no editing, re-writing, spell checks or illustrations are required during the thirty-day writing period of National Novel Writing Month.