• Buffy the Vampire Slayer
• Twin Peaks
• Six Feet Under
• Friends
• Oz
• The L Word

Not at the same level:

• Angel
• Dexter (actually I don't really like it)
• Skins
• Nip/Tuck
• Californication
• Misfits

Fun but not great:

• Desperate Housewives
• Grey's Anatomy
• The O.C.
• Sugar Rush