What Permission System?

Hey all.
I have a minecraft server and I have had it running for about 2 month now.
All that time I’ve' been using white-list system, but now it has gotten so popular that I need a proper permission system.
When I search for permission system theres quite a lot plugins to choose from, so I need a little help.
I want a permission system that first of all is easy to use and setup. Second of all I need 3 groups: Guest, Builders, and Admins.

Anyone can help me find the plugin I need?
Best Regards Exill.

 

There is no better alternative than: http://forums.bukkit.org/threads/admn-dev-permissions-3-1-6-the-plugin-of-tomorrow-935.18430/

This is the permissions plugin that almost all plugins support. I'll be honest it's not the easiest to set up, having to edit .yml files and all, but once you get the hang of it you'll be fine. It's very powerful, supports groups, nicknames, world guard etc. Plugins have special permissions attached to them, ex. for my Giant Trees plugin, something like gianttrees.build. Permissions can be attached to a user or a group.

 

Thanks. I already had a look at it and found it a bit hard to figure out. I’ll try and give it another nudge. ;D