Techno is too dark and ruins the psycadelic vibes? These dosse posse characters sound like a bunch of pansies to me. Wheres Cartman when you need him, he'd sort it out - "feckin hippies, I hate hippies, kill em all".
Seriously though, I reckon parties should be for the masses, and therefore the music selection should reflect that. A nice selection of all sorts over the course of a night makes it more interesting to more people, therefore making a better night I reckon. If I want pure bangin techno all night - or d'n'b or breaks or whatever, I'll pay my money to go to a club.