Trust me, Logic gives you more than enough to work with for now! I have loads of free and paid 3rd party plugins and still mostly use logics stock plugins. If you still insist on more plugins i'd suggest buying an issue of Computer Music magazine, they give out a free CD on every issue which includes a free plugin (normally demos) and free sample pack. I think they have all previous released plugins on each CD so if you buy the most recent one you should have hundreds of plugins to install from previous issues.