I think Hook in particular is pretty high at 400 million. When it comes to Stern games, Ripley's and WOF are no casual walk in the park at 75 million each.
Back in the day it seemed most Bally/Williams 90's games had defaults set pretty low to allow people to get high scores quickly. Data East and Sega liked to make people work a little more. Stern used the 75 million benchmark for awhile over a few games rather generically. Other manufacturers are all over the board depending on games. What specific games do you think had the hardest default GC to beat?