Another vote for the Metasonics TM1 and the sonic alienator. Also the EH flanger hoax - and recently I treated myself to the digitech 'expression factory?' not sure of the name (I'm at work). Anyway recreates some classic old pedals and adds various distortions too. Very pleased with this and real good value.
"On the following day , the sorcery undespairingly continued: I changed my series, chose other sequences, cut other lengths, spliced different progressions, and hoped afresh for a miracle in sound." (Stockhausen)