very few, and 32000 is more than you need for any model. plus dx will just add the others through software.

As far as guidlines go, it has a lot to do with texture size, the target framerate/resolution, types of shaders, and what all calculations you have going in the scene at once. If i were making a game, I'd shoot for about 150k - 250k polys visible at once. but that would be for a semi decent machine.