Which hip hop album should be a must-have in every fan's collection?

Wu-Tang Forever

OK I'll name just one that hasn't been mentioned

Criminal Minded - Boogie Down Productions

I agree with Paid in Full, Ready to Die, Illmatic and It Takes a Nation of Millions...

Even though they may be classics the rest I'm not sure about - Low End Theory, Midnight Marauders, 36 Chambers, The Infamous.

The Documentary- The Game

Only Built 4 Cuban Lynx

I would have to say a official mix album like at target or somewhere

that featured all hit hip hop songs from the 80's

Talib Kweli and Hi Tek Are Reflection Eternal - Train Of Thought

The Roots - The Roots Come Alive - It's a live album but its still mindblowing.

*Waits for Illmatic*

Edit - I don't think 1 is fair, If you think of the idea of classics as a tapestry, You need to look a lot of albums to see how well its been woven. As well as different albums are classics for different reasons.

The Roots - Things Fall Apart

Midnight Marauders

The Greatest Adventures Of....Slick Rick

The Impossible Question.

I agree with SkiCap's edit 100%

...but if forced: "The Fix" - Scarface (closest classic I could think of that gives a little bit of everything)