Diggit Drupalextras

Hi !
I want ask from you drupalers some advice about performance and hosting solutions.
1.How big is big site? - how many visitors are more than normally and in that hits(visitors) number hosting companis (like godaddy,bluehost and more same companies) will say that now its time for your private server.
2.How many nodes - (videos too) Drupal can handle in normally hosting services.(normaly I mean shared hosting).
3.That you think about use views,cck and panels modules in site. I read in internet that this use will be very big performance issue.Some people write that use this modules is not problem - that is yours opinion?
4.How theming may change site performance? I need advice about solution then needed display different content types in different pages. How I can do that best way?
5.Let me now all + and - about creating big sites in Drupal.That Drupal is good I now.