What to do?

NaNoWriMo is next month. Last year I got a hefty start on my novel using this forum. I wrote over 50,000 words and completed about 1/3 of my book. I'm wondering whether to set off on this adventure again this year.

Here's the pros:
I could get another third of my novel done.
It's good practice for novel writing, which I hope to do more of once I move to Ohio.
If I can do it this year, there is no excuse for not writing when I am not working.
People are waiting for this book.

Here's the Cons:
I'm already writing a lot at work. In fact, I'm putting out about 100 pages/month.
It's hard to switch from tech writing to novel writing.
I have even less time this year than last.
Last year, I had just started this job in November. I was learning, not writing.
The book has gotten long enough that I need to do some organizational homework to be more efficient with the writing. For example: a name dictionary for secondary characters.

So readers, do you think I should jump back in?