... Read THIS
for some top tips on finding almost any game you could possibly want ......... For the Amiga that is
As for the biggest archive, well as you say PE2000 (Which is the largest accessable collection) doesn't have your games so how would knowing an even bigger archive help you??
What you need are smaller archive's, yes you read right smaller archive's as these often hold some rare gems. Warlock99 (A member here) runs such a site.