I think you could install a Miracle Man set for the PRS - its the tightest pickup (and heaviest!) i've ever played and the cleans you get (especially from the neck) are actually really nice!
i heard the cleans were not that great on the MM.
+1 for the miracle man
the clean tone isn't great compared to the alnico BK pickups, but it's better than any other ceramic pickup i've played (except the bill lawrence usa l500xl)
it doesn't distort, so it's fine, just not as detailed as a holy diver, for example
with the holy diver i can play clean even on distorted channels with the boost pedal turned on, only by rolling off the volume knob
with the miracle man, i have to turn off the boost, but the pickup by itself is clean