web site design for about infections

I need a homepage and article page design for a web site that is about the various infections that we encounter everyday. You can view the current site at http://www.aboutinfections.com.

Some sites that I like include:
http://www.healthstatus.com/
http://www.fitnesshealthzone.com/ (but put navigation on the left)
http://www.exploreasheville.com/index.aspx (color scheme & fonts)
http://www.sideroad.com/
http://www.helium.com/

http://www.aboutinfections.com

I am an entrepreneur who developed a healthcare web site all about infections. I am looking for a design that will take it from looking like an amateur built the site in his basement to one that people will believe to be an authority on the subject matter. All the content is medical correct, referenced and original. The site must be SEO friendly, so I need to be able to replicate navigation elements and page titles with CSS. Ignore the current color palette, and develop on that reflects the subject matter. I do want to add a photo gallery page to each section, so please keep that in mind.

- Must be SEO friendly, so navigation elements and page headers must be able to be done with CSS.
- Must use the current tag line on the web site.
- Must utilize left hand navigation and be scalable to add additional topic areas.

I don't want anything thing that looks like the current web site.