I've had good results with the waves plugins and izotope's stuff. the plugins that come with 2.0 are pretty good as well.
One thing that I've noticed that is if I'm only working with the VST's and a single wave file, if I apply more than mabey 2 or 3 plugins, a lot of them will be grayed out for some reason. I just put them all into the mastering rack.
Then again, the problem I encounter with that is if I want to use the Waves 10 band eq, I have to for some reason manually put it in the mastering rack each time I go to edit a file. Doesn't matter if I load the direct X or VST version. wierd.