Static pages with dynamic content: Good for SEO?

[Bio-RadAbs]

I wanted to know ones thoughts on reducing duplication by creating a static page with a few dynamic fields. Has anyone done this?

If 75% of a page is static and 25% is dynamic, is that a good ratio? It's an idea I am thinking about to combat duplication issues affecting ecommerce pages. Some ecommerce sites generate a new page for a small change like size, but the content is the same. What if you could create a single static page and depending on the size chosen, only those fields connected to the size are dynamic? Everything else remains the same.

For caching purposes, you always submit a cached page with default values.

Wouldn't this work? Isn't this a solution for duplicate ecommerce pages? It would also help in ranking, rather than multiple external links across duplicate ecommerce pages, it would just be to a single page.

[AlanMosley]

Yes I think this is better then having thin content, your links if you are lucky enough to get them would amass on the same page.
You would probably only rank for the static content, at least over time, but that is probably what you want.
I would have access to this page via POST not GET to avoid querystring in the url