Join the Intel-club, man... lol. I'm in the same boat as you on this one. I've found that with my Intel chip that I have to use all three plugins: Rice 6.0.0c, Rice Daedalus, and Jabo. It's best to experiment by switching between the 3 plugins to see which ones work the best for which games.
You definitely shouldn't be using OpenGL, you should be using Direct3D.
Also, if your plugin supports it, you should turn off "Using Software Vertex Clipper" and "Force Software Transforming & Lighting." It cleared up strange glitches for me, like "texture triangles" cutting out of the ground and stuff like that.
Is there any game in particular you are having a problem with? Or just all of them in general? :-| Glitches could occur in one game with a particular plugin but then have no glitches at all with the same plugin.