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Try to keep the usability good.....have an HTML version and a Flash version.
Try to keep the speed up, which means small download times and also have the files relatively small in size.
If you were really intent on using Flash, a way to have the site rank well would be to use cloaking.
Now imagine yourself positioning a layer behind the Flash movie using an external css file and whatever absolute positioning necessary to put the text up high on the page while keeping it invisible behind the movie.
This is just one possibility.