Wu-Tang Clan (classic, new album in a few weeks)
MF Doom (I've got all his sh-it except special herbs, but I heard it)
Madvillian (Not a real fan but its still good, Rhinestone Cowboy=thumbs up)
Dangerdoom (Not like Doom's other stuff, still good)
King Geedorah (Fazers!!!!!!)
Viktor Vaughn (Venomous Villain and Vaudeville Villain are 2 of my favourite CDs) (havent listened to MF's aliases much)
Monsta Island Czars (if you can find it, be prepared for really good sh-it)
Aesop Rock (good but it starts to run together)
Method Man (Tical 2000 is a great CD)
Raekwon (Wu-Tang's finest)
Del the Funkee Homosapien (reminds me a lot of Doom, so great stuff)
UGK (Super Tight is a great CD)
TI (I'm becoming a big fan of his stuff, especially King and TI vs TIP) (Does he actually have good lyrics? Cause he seems to mainstream to me, even if some of his beats are dope)
Tech N9ne (I'm serious get his sh-it, Everready is a great album) (Some of the fastest delivery of lines I've heard)
Lil Wayne (Becoming a bit too mainstream for me, I liked him back in the day, mixtapes aren't bad though) (Same as TI ABOVE)
Royce Da 5'9" (you mentioned him)
Beastie Boys (Paul's Boutique and Licensed to Ill are great)
Nas (obviously)
De La Soul (good sh-it)
Mos Def (I'm a fan of Black on Both Sides)
GZA (Liquid Swords!)
Basically anyone performing at Rock the Bells, they're all worthy of being on anyones playlist
I can keep naming and naming good rap as my iPod is full of it and its pretty much all I listen to, but I'll stop
(obviously Doom and his aliases lover here)