[chrisa]

I guess it depends on how happy you are with your existing lens, you say it's good. I don't have either so can't comment on their quality.

You're not gaining much in terms of 80-200 to a 70-210. If you're happy with your current lens I'd maybe think about putting the money towards a lens that gives you different photographic opportunities, eg longer telephoto, wider lens eg 28mm etc.

No sure of the price, I guess you can search the web / ebay to get an idea.