Well, in my collection resides currently 358 albums (including box sets, etc.)...not what I would consider a large collection (especially around here). But here are (currently) my very favorites out of that collection. They range from somewhat unknown to quite well known, but then again I don't know who's heard of what, so here goes (in no particular order):
Joey Stuckey ~ Take a Walk In The Shadows
The Police ~ Outlandos d'Amour
The Police ~ Ghost In The Machine
Synergy ~ Audion
Radiohead ~ OK Computer
The B-52's ~ Whammy!
The B-52's ~ Time Capsule
Hole ~ Live Through This
Hole ~ My Body, The Hand Grenade
Pink Floyd ~ Animals
Pink Floyd ~ Dark Side Of The Moon
Pink Floyd ~ Echoes: The Best of Pink Floyd (or better yet, just buy their whole studio collection!)
Lexx: The Series (Original TV Soundtrack)
Alanis Morissette ~ Jagged Little Pill
Beastie Boys ~ Beastie Boys Anthology: The Sounds of Science
Rush ~ Moving Pictures
Rush ~ A Farewell To Kings
The Chemical Brothers ~ Surrender
Fatboy Slim ~ You've Come a Long Way, Baby (...worth it if only for tearing up codecs with
Kalifornia 
)
Milla ~ The Divine Comedy
Ozric Tentacles ~ Jurassic Shift
Primus ~ Pork Soda
The Clash ~ The Essential Clash
Sass Jordan ~ Rats
Scorpions ~ Deadly Sting: The Mercury Years
Johann Sebastian Bach ~ The Brandenburg Concertos (Il Giardino Armonico)
Smashing Pumpkins ~ Siamese Dream
Talking Heads ~ Popular Favorites 1976-1992: Sand in the Vaseline
The Cars ~ Candy-O
The Beatles ~ Rubber Soul
Tool ~ Ænima
U2 ~ The Joshua Tree
The Prodigy ~ Fat Of The Land
Lara Croft: Tomb Raider (Original Soundtrack)
And only if you're a big '70s fan...
Have A Nice Decade: The '70s Pop Culture Box
These are just my *very* favorites, anyway. Not many unknowns IMO, but as I said, I don't know who's heard of who. For example, most people know Milla Jovovich from movies (The Fifth Element, Resident Evil, The Messenger), but how many know of her music?
Good tastes in music, I'm especially impressed with the Lexx Sountrack, I wish I had it
; but wasn't this thread supposed to UNKNOWN artists? I think the Lexx selection is the only one that really fits here . . . .