I need to expand my library of bands I'm familiar with (and need to be aquainted with)and need some help on deciding which albums to get or put at the top of my wantlist. Please just one suggestion per band (I don't need two or more people giving me a laundry list of albums for each band), I'll pick the one picked the most or if not draw from a hat. These are the bands:

Rage
Lefay
Arena
Jorn (I have The Gathering, Unlocking The Past, & Spirit Black)
Pagan's Mind (I have God's Equation)
Raven
Sacred Reich
Scorpions
Tad Morose
Twisted Sister (I have Stay Hungry)
Twisted Tower Dire (I have Crest Of The Martyrs)
Accept
Vanden Plas (I have Christ 0)
Threshold
Voivod
Candlemass
Forbidden
Iron Savior
Virgin Steele
Angra

Much appreciated.

my vote goes towards Forbidden.

Actually I'm looking for suggestions for each band, sorry if I didn't make it clear.

Scorpions - Taken By Force
Twisted Tower Dire - The Curse of Twisted Tower (recently rereleased in a remastered and remixed double disc package with demos. It sounds amazing... a lot better than the original 1998 disc on Miskatonic Foundation)
Accept - Balls to the Wall
Candlemass - Epicus Doomicus Metallicus (I cannot stress enough how perfect this album is!)
Forbidden - Forbidden Evil
Virgin Steele - Invictus

The Scorpions, Virgin Steele and Accept picks were hard, but these are all my personal favorites.

Lefay - S.O.S.
Jorn - Worldchanger
Scorpions - Blackout
Tad Morose - A Mended Rhyme
Twisted Tower Dire - The Isle Of Hydra
Vanden Plas - The God Thing
Candlemass - Death Magic Doom
Forbidden - Twisted Into Form

Rage - Soundchaser
Scorpions - Blackout
Accept - Restless & Wild
Threshold - Hypothetical
Candlemass - Epicus Doomicus Metallicus
Angra - Fireworks

Rage--Missing Link
Candlemass--Tales of Creation (I'm not into 'doomy' stuff so much but I love this disc)
Accept--Restless and Wild
Forbidden--Twisted into Form
Sacred Reich--the American Way (you will probably end up destroying something while listening to this disc--most likely your neck).
(Most of the others I am familiar with only one album.....)

Lefay - my fav is THE SEVENTH SEAL.

Raven - you must, must, MUST own ALL FOR ONE!! Their absolute high water mark and one of the greatest metal albums ever recorded IMO. Yeah, I'm a fanboy. You might also like STAY HARD and/or ARCHITECT OF FEAR.

Tad Morose - UNDEAD, MATTERS OF THE DARK, and MODUS VIVENDI all kill. Their vocalist at that time (Urban Breed) has one of the best sets of pipes in all of metaldom.

Twisted Sister - go with YOU CAN'T STOP ROCK N ROLL or UNDER THE BLADE. Skip COME OUT & PLAY and LOVE IS FOR SUCKERS.

Rage - Black in Mind/Speak of the Dead (coin toss, either or)

Pagan's Mind - Celestial Entrance

Tad Morose - Modus Vivendi

Iron Savior - Unification

Scorpions - Taken By Force, Animal Magnetism, Blackout, Love At First Sting

SACRED REICH - Ignorance (not a high priority, sounds like early Metal Blade-era SLAYER)
VOIVOD - Nothingface (Awesome, highly original metal)
FORBIDDEN - Forbidden Evil (awesome classic Bay Area thrash with skilled guitars and vocals)
CANDLEMASS - Epicus Doomicus Metallicus (excellent cult doom metal with lots of great riffs and songs)

Some of those bands have different phases, so depending on what you are looking for:

Rage- Perfect Man (heavy)
Rage- Ghosts (melodic)
Morgana Lefay-Past, Present, Future (classics)
Lefay- Seventh Seal (heavy)
Tad Morose- A Mended Rhyme (melodic prog-doom)
Tad Morose- Undead (heavy)

also:

Angra- Angels Cry/Holy Land might still be available together.
Threshold- Extinct Instinct

also for my personal two cents, if you don't have any Ten, get The Twilight Chronicles if you want a good melodic epic.

Will answer in detail when I have more time....

but for what it's worth I have;

Jorn - Out to Every Nation on my sell/trade list.

Rage- Execution Guaranteed
Raven- Wiped Out
Sacred Reich- The American Way
Scorpions- In Trance
Twisted Sister- Under The Blade
Accept- Metal Heart
Voivod- Killing Technology & The Outer Limits (I know you said one album a band, but two are required for the Voivod)
Candlemass- From The 13th Sun
Forbidden- Forbidden Evil

Raven-All for One-Listen to FF, this album kicked ass and still kicks ass.

Scorpions-Taken By Force- this album is sort of preview of what the Scorps would sound like in the 80's, great songs, great ballads (before the term power ballads existed) and Uli Jon Roth is one hell of guitar playing. This album is my favorite by this band, class act all the way.

Twisted Sister-You Can't Stop Rock n Roll- A band hungry to be the next big American metal band, not pop metal and not thrash, good old fashion kick ass American metal and features the best set of tunes the Sister boys ever layed down on wax.

Accept-Balls to the Walls-Again one of the best metal albums of the 80's, strong political overtones and classic landmark metal recording

Voi Vod-The Outer Limits-One of the most original metal recordings in the long history of the genre plus extra points for covering Pink Floyd's Nile Song.

Accept - Restless & Wild
Twisted Sister - You Can;t Stop Rock & Roll
Scorps - tough one....... start with Blackout

I'm only really familiar with one of those:

Iron Savior -- Go for Condition Red. Their best album.