Hi Spacegirl,
Welcome to the forum!
I have read the whole thread with lots of interest. I believe all the ideas and tips from the others here are on spot. I definitely hope that it all works out for you and your JW husband. I am of the opinion that if you manage to work out all the quirks and problems caused by one of you being a JW and you love each other, you should stay together.
I just wanted to share an interesting link with you about an article I recently read. I think the more you know and the more arguments you have, the better. Not that he will accept them, but information never hurts in my opinion.
Here is the article: "The Myth of the Pagan Origin of Christmas".
Having said that, I do agree with the others that it has much more weight to use their own literature, as in the already mentioned article from the 1960 Watchtower which, by the way, you can read in its totality online HERE, just go to page 736.
The other article from the Awake of July 2009: "Is it wrong to change your religion" can also be read online, just go to page 220 on that PDF.
I definitely believe those two articles are your best bet.
Just my two cents.
Vivalavida