I think a dream collection all comes down to space. Your wishlist might have 20+ games, but if you don't have the space (or cash), it's never going to happen. You have to be realistic. Now that my tastes have developed, from actually PLAYING pins firsthand instead of discussing them on a forum, I have a good idea of what I want.
Here's what I'm working on....
3 modern pins................(MET, IMVE, TWD)
1 90s Bally/Williams........(BSD)
1 Early 80's Bally SS.......(Flash Gordon)
1 System 11..................(Taxi)