Well, Frank never really used drugs or drank, so none of his stuff can be really called "psychedelic."

He was just naturally one weird dude.


Personally, I would say Zappa in New York because it's an outstanding live album, Cheap Thrills because it has a good mix of his material (and, if you check the price tag, is very aptly named), and maybe some of the original Mothers of Invention stuff for your "psychedelia."

Also, get the Baby Snakes DVD. Don't even try to watch it if you're drunk or in an otherwise chemically altered state because there's simply no way you're going to be able to follow it.