Asmodeus 20
Baalzebul 21
Baphomet 20
Demogorgon 20
Dispater 20
Fierna 16
Fraz-Urb'Luu 12
Geyron 20
Glasya 20
Graz'zt 21
Jubilex 20
Levistus 20
Mammon 21 + 1 = 22 Especially after reading the Pathfinder write-up, which can be edited into a god of wealth, money, and greed
Mephistopheles 21
Orcus 18
Yeenoghu 20 - 2 = 18 Need more personality than 'go crazy slay all BLOOD" to be a good Demon Lord
Zariel 19
Zuggtmoy 23
and BTW, Mordenkainen, you forgot somebody:
Eltab 20