Many use higher yet. 1 is too small. I viewed your site and while you ARE are very good designer and your flash looks real good, it did take me about 15 seconds to load on a dsl line. Many people would not wait for this. They want to find the info fast on a site.
People are in a hurry on the net and love to click on things.
Also, the front page of any site is the most important to search engines. It is extra hard to get a site ranked with a flash front page. You have to have a lead-in page or you have to have a couple of paragraphs of content below the flash display. There are issues involved with flash. Most are of the usability type.