Ignoring highball types things-
Nosferatu - Burbage South (not really E6 ?)
Genocide - Cratcliffe (font 7a on a rope)
Flex - Rivelin Quarries (slate-esque)
Mothers Pride - Millstone (sporty, F7a+/b)
Winters Grip - Millstone (you need two short knifeblade pegs, and then it's quite safe so not really E6 ?)
Desolation Angel - Wharncliffe
Make it Snappy - Gardoms
Pulsar Direct - Higgar (font 6C on a rope. Also Block & Tackle ?)
Salmon LH - Bamford (not really E6 ?)
Kaluza Klein - Robin Hoods Stride (when you're >6ft!)
Gritlist is useful
http://gritlist.wikifoundry.com/page/E6+Peak+District