My ideal League (if going with the pantheon of Gods route) :

Superman
Batman
Wonder Woman
Green Lantern (Hal and John rotating)
Flash (Barry and Wally rotating)
Aquaman
Martian Manhunter
Starman (Will Payton)
Mera
Black Lightning
Vixen
Zatanna

Powerful, experienced, capable, diverse enough to handle any threat Alien, Magical, Domestic or otherwise, and not a sausage fest.