Travis,
PVC dust collection is perfectly safe, much cheaper and much easier to install than metal.
The velocities and volumes generated from your average hobby or small shop dust collector is not nearly enough to cause a static discharge that could result in a deflagration of a dust cloud. It's basically a myth.
FWW had an article about that a couple of years(?) ago.
Uless you are running truly industrial equipment (mutli-thousends CFM, very high velocities, long runs) there is absolutely nothing to worry about.
Bernhard