Install Drupal

Instead of a default profile, user should be presented with a “meta-profile” of that kind:

(( ) is a radio button, [ ] is a checkbox):
......( ) default install
......() custom
............[ ] blog
..................( ) single user
..................( ) multi user, family (around 1-10)
..................( ) multi user, farm (100+)
............[ ] wiki
............[ ] wiki
..................[ ] MediaWiki-like*
............[ ] whatever
............[ ] enhanced security
............[ ] whatever

* “MediaWiki-like” means a bundle of revision, diff, wikitools, flexinode, talk, edit_section and table of contents modules (and probably others, too).