Every business will require its own style of landing page. The below landing pages convert very well for their particular niche. You'll notice there is no flash, no fancy scripts, and no videos. Keep that in mind when you are considering spending $10,000 for a fancy website from a graphic design company!
Most SEO/SEM companies will insist your content needs very specific keyword percentages on every page of your site in order to rank well. They will want to charge you for rewritting your entire website. Is it necessary or is it overkill?
In my opinion, it is overkill.