SEO OsCommerce store.

To make my site more search engine friendly I have already installed contributions: - Sitemap SEO - Header Tags SEO - SEO URLs - SEO Assistant To make it top SEO I have tried to write in a search engine friendly way (meta and text) and I have also tried to use a SEO coding technique (use text instead of pictures, text instead of flash etc etc). What more is there to do? Is what I have done so far correct? Your bid? Time frame? If I find your bid and work history interesting - you will receive a link to my site in order to make an analyze of my site and to give me a more definite bid. Thanks.