i think that they are pretty unknown everywhere.
their classic album is Torch of the Mystics. its a masterpeice. its also pretty structured and less bizzare as a lot of their albums. so that might be a good place to start. the first album of theior that i heard was their self titled 1st one. and its pretty amazing as well so you can try that one out. horse cock phener is also amazing and probably their most "rock" album. just dont get put off by the extremely crude lyrics.
aftyer those id check out 330000 crossdressers
dantes disnyland inferno
box of chameleons
flute and mask
heres a lot of their classic albums to download