I know you problably won’t want to be using yet ANOTHER plugin, but can I make a suggestion to use a highly configurable plugin which handles custom fields / groups, custom post types, and custom taxonomies?
Really great, simple, and easy to use plugin. No hardcore advertising. Doesn’t bog down your wordpress website. This plugin is also developed and updated actively.
Download Types – Custom Fields and Custom Post Types Management
I use this plugin on almost every wordpress install. Should be fantastic for what you’re trying to do.
Note: this plugin was also reviewed by Joost de Valk, on the Yoast website.