You have an extremely well designed site, very professional in every way and not only in appearance.
You have a decent page rank right now, 4 out of a scale of ten according to google's page rank system.
With a site designed as well as yours, the only thing I can see that will increase your page rank and page positions would be to receive more hits to your site. The sites with the most visitors and most relavent inbound links, are the ones that get highest page rank and page positions.
Unless you're willing to pay loads of money for promotional advertisements to increase traffic to your site, you should add a links page or link directory to your site.
By having a links page or links directory on your site you are able to exchange links with other top sites related to yours which, will not only help raise your page rank through increased targeted traffic to your site, it will move you up the ladder in page position on the search engines also!
If you add a links page and begin to exchange links, be very careful about who you link to. Poor linking stratigies can lower your page rank and position. All link exchanges should be done in-house, that way you have full control over who you are linking to. There are businesses out there that will provide and maintain an automated link program for a fee however, automated linking can make your site disappear from search engines.
CyBoR_WolF
http://www.Quality-Wholesale-Products.com Rock Sign