When you clean a BI, you'd normally get funky colored fluids, strong green and blue stuff that I've seen so far. Not the dirty brown/red stuff Thermochill has sometimes, but definitely something you'd need to clean a while before you use it.
From my tests, you'll need a GTX 480 to get better performance than with a PA 120.3, but even then only when you ramp up the fans at 1200rpm for slightly better performance.. 900rpm and below, the PA is still in front (way in front at 600rpm).