I had to make the decision this weekend between the II and IIs. Since they were the same prices, I immediately ordered the IIs for the increased resolution. However, I wanted the 18-135WR lens, and if I bought that with the IIs, it would have totalled $1500 (1050+450) instead of the $1350 for the II+lens. Also, as I read more and more pages here on the forum, it seemed like there was definitely a higher (of course, YMMV) chance to get moire in all types of photography, and I didn't want to bother with the nagging worry that it would show up in my pictures.
So I decided that I would probably not need to worry about the increased resolution since I wouldn't be pixel peeping all my pictures, and that the II would still be an awesome upgrade from my K-x, so I cancelled the IIs and bought the II instead.
So the cost savings and realization that I would enjoy the II just as much as a IIs with a little less worry on the side.