Multiples plataform plugins on same installation.

Is it ok to install a lot of plataform plugin on same wordpress installation?

Plataform plugins I mean: Q&A, Forums, Events+, Directory, etc. And I'm considering a wordpress installation with a lot of blog posts and news posts from multiple authors.

Or is it a better idea to create multiples websites?

What would be a good solution for perfomance and maintenance?

Thanks