A very good plugin for all video-cards (including yours) is Jabo's Direct3d8 1.6, which is bundled with project64 1.6. Another good plugin (which is more advanced) is Rice's video plugin. Check the download-section for the latest version.
Actually...Its kind of hard to tell which plugins are best, all of them are good at something, so it really matters what you want the plugins to do. I have alot of plugins...maye ill release all the ones i have in a zip.
Here is a huge-ass pack of plugins i found usefull (contains, video, audio, input, and rsp plugins, with the exact config i have for them on my comp)
but a word of wisdom, i would back up your old plugin directory before adding mine. Hope this saves people alot of time looking for plugins.arty: file is about 6.5 mb.
The plugins found with pj are not allowed to be redistrubuted outside pj.
And check out bighead's n64 list - it's a list that lists what plugins to use for what games. Very handy.