Stefán Kjartansson has a new display face available called Black Slabbath. We had a chance to use a dub plate / cdr last summer on a poster and felt like it handled very well, getting the crowd at PS1 and agnes b. jumping. (thanks Israel)  It really is the heaviest typeface in the world and has razor thin lines cutting through geometric shapes. Nigel says to turn it up to 11 in adobe illustrator for best results.