PSA: 5 (FF, Black Box, Fleer Glossy Black Box, Black Scribble and "Whited out vulgarity".
SGC: pretty much the same. Nothing set in stone. The white scribble - I've seen "airbrushed", "scribble" and "whiteout". They also correctly labeled my progressive proofs.
BGS: 6. They list them #616A-E (FF, Whiteout, White Scribble, Black Scribble, Black Box) plus the Glossy edition.
GAI: they were the only one to do custom labels for each special version. Different black scribbles, sawcuts etc.
http://www.billripken.com
Many true different variations.