How to center the text in the main nav bar?

Hi, liking the theme thanks, easy to use and set up as well as looking beautiful.

I am trying to center the text of my main navigation bar because I think it will look better for the site I am working on.

I have used the following CSS to try to center the menu options:
#access ul{margin: 0 auto; width: 669px; }

This has centered the menu options but they look a bit bunched up to me. What I’m trying to do is center the menu options but also space them out across the nav bar so they look better.

I feel that either I’m nearly there or there’s loads more to do to get it to work.

Thanks for any help you can give,
Jules