Any good directory themes recommendations ?

Hi,

I run a maritime company and want to make a “directory” site with a map.

This site will have all the companies around the world we cooperate with listed, advanced search fields so when the user searches for a company (choosing some search criteria) to show on the map and as a listing.

I want to be able to customize the theme in case I have to.

Are there any recommendations? Any help would be really appreciated.

Regards,
Nikos P.