Just get the whole set... it's usually cheaper. Like everybody said.. Pressure plate wears out because it's a spring, resurface the flywheel cause the flywheel surface and the clutch wear into each other (think disk brakes), and the throwout bearing could always be replaced.
One thing though, if you take out the flywheel go ahead and invest in a REAR MAIN SEAL. It'll save you in the long run.
Quick question though, are you gonna pull the motor and trans or just drop the transmission?? Just curious. :biglaugh: