Well the D300 doesn't have video, the new D300s does. I personally wouldn't let the fact that they have video keep from making your decision. You don't have to use it. Personally I would wait a little bit and see if the price on the D300 comes down as the new D300s starts shipping. The D200 would be an upgrade from the D80 but more in a user interface and controls standpoint, it has controls for everything lol.
If you like the d200 you can sell your d80 on ebay and buy a used d200 for practically the same price. I owned a d80 for 20k shots and had a falling out with it over time, but am in love with the d200. :smile:
Even if you don't plan on using video, it shouldn't be a deciding factor in which body you choose. Eventually, I suspect video will be in all dslr's, and the price will be built in.
The D300 bodies may fall a little bit, but it will be because of several upgraded features, not the video alone.
I felt that I didn't need or want video in my dslr, but I have to admit that I've enjoyed playing with it in my D5000. I don't use it all the time, but I'm glad it is there. It has certainly changed my feelings towards the video migration that we are seeing.