Real hard to put a finger on just one album, so I will try and select some of my favorites that differ from each other the most.
From the familiar stuff category I would reccomend Stevie Wonders "Songs in the Key of Life" and "Hotter than July" albums, but you probably know all the songs already.
From the phattest dnb album I have heard in ages category I would suggest "
Uprising" by Concord Dawn.
Some really mellow but musically clever stuff can be found on Funki Porcinis
Fast Asleep album. Wicked smoking album, comes with trippy dvd.
NWAs
Efil4zaggin remains my favorite rap album of all time, but if its too immature then my second favorite, Ice Cubes
Lethal Injection is a bit more intelligent (while remaining firmly in the gangsta category).
And lastly my favorite album of the past year, a reggae album with a good mix of poppy and not-so-poppy tracks on it.
Katchafires Revival is a must. It comes with a free dub remix bonus cd.