I participated in NaNoWriMo this year (first time attempting at a novel as well). Managed to hit 20K words, but the story went nowhere and I lost interest by the end. Might pick it up again someday again.
If you're anything like me you'll probably never return to finishing the novel and it'll rot on your hard-drive for years to come. At least if you package it up as a short story it'll be just as rewarding as a completed NaNoWriMo.
Then if you're happy with it you can still publish the short as a kindle ebook (Which can probably be completed by the end of January and you'll start off the new year accomplishing significant.)