Which 3d party plugins are still necessary with Logic 8?

[antichef]

I use Logic Express 8 - when I got it, I was pumped because of all the high quality plugins. I'm still learning how to use them (I haven't even mastered the "Channel EQ" yet, for instance), and won't be done with that any time soon, but I thought I'd ask:

With all the plugins that come with Logic 8 (express or studio, whichever you use), which third party plugins do you think are still necessary or desirable for what you're doing?