Yeah Sugar Hill Gang is classic, listen to their 'Rapper's Delight', thats true oldie Hip Hop.
Try listening to Ugly Duckling too (their last two albums). Their not quite as complex as other artists mentioned in this thread but their a good laugh and have a light tone.
Blackalicious is pure skill, he's not controversial, philosophical or exceptionally funny, but listen to Chemical Calisthenics, A To G, and Alphabet Aerobics for speed.
Jurassic 5
CunninLynguists
Herbalizer (Goldrush, The Real Killer)
Fugees (classic )
SOME Mos Def (Speed Law is a good song)
Nas (One Mic, dont know if its your sort of theme taste but try it anyway)
Outkast (Ms Jackson, Bombs over Baghdad, Xplosion)
Pharcyde.
Thats just a few ^^