i wouldn't call DP4 especially quirky and lofi, but it's not pristine either. Boss SE70, SRV330 and MPX1 are also fantastic in this btwn the extremes range.
few units i've run into, that follow OP description more to the letter:
Dynacord DRP16...dirty lofi late 70s digital reverb ... strings, pads and even step sequences sound evocative as if coming from another, prehistoric, psyhedelic era.
PCM60 one of the dirtiest lexicons. classic. tho usually not dirt cheap.
Roland SRV2000 .. dirtier,, cheaper roland version of PCM70 style machine. sort of. btwn $100 and 150. has a delay mode too.
Dynacord DRS78.. early digital reverb and delay.
Last edited by clusterchord; 1st March 2015 at 12:56 PM..