Although I no longer work in Flash animations, preparing animated gifs has been a long time favorite past-time (actually over 15 years experience in creating them - back to the GoGraphics Group of CompuServe). I am assuming that the original artwork is suitable for the project, but can work around digital imaging as need be. Would be willing to build a quick "Sample" if required ahead of time.
I prefer animated gifs primarily as a browser issue - and that there's actually less work involved in achieving a near-same results in instances such as banners, site eye-candy, etc.