The Headshrinker album is quite the intense listening experience...old school death metal (the first minute of the first song is pure Swedish DM!) morphing into a dark, obscure, dissonant beast. Not a "fun" album, for sure, but it got my attention.
Hooded Menace is great - see a few posts above (thanks twosuitsluke!
)
Then a couple of random old albums from the early 90s...fun listens if you are in the mood for some Queensryche mixed in with 80s hard rock...