there has been some real poo posted in here, run dmc, vanilla ice, the sugarhill gang? please lol
Even the early west coast stuff imo isnt that good, NWA were good, Ice Cube was good (he wrote most of nwa's stuff, and his solo albums were great) The Chronic was good too (Dr Dre). But lyrically they were average, they were just fun to listen too. Also check out Doggystyle by Snoop dogg, Gin and Juice was brilliant
2pac was legendary i agree, but im pretty certain he didnt write his own stuff a lot of the time. He left behind a huge legacy and recorded so many songs, i think theres still a few hundread not heard/released yet. So you cant miss him.
The mid 90's to late 90's New York stuff was where hip hop peaked, Nas Illmatic best hip hop album ever made, It was written was also highly underated. There is literally not one bad song on Illmatic, my favourites though are It aint hard to tell, and Memory Lane (and Half Time, and NY state of mind, and Represent

)
Big L Best US hip hop lyricist ever (there are a few underground UK artists with better lyrics imo), what he came out with was crazy, his freestyles were incredible, RIP, he died before he reached any fame, and is seriously underated/unheard of in the general public.
, Wu-tang and the members solo albums (check out Rakweon-only built for a cuban linx, ghostface killahs albums were good too).
Also no one has suggested Mobb Deep's early work, The Infamous was a legendary album. Theres plenty more:
Kool G Rap
A Tribe Called Quest
Gangstarr
The Roots
Redmans first two albums
Notorious BIG - ready to die was brilliant.
Killah Priest
Dead Prez
RZA
Ill post some links in later when ive got time.