I figure a "complete collection" means either every knife ever made with any intrinsic value or a good knife for every likely use. So in my world right now that is;
small- SS4
medium- S6 (best user knife ever!)
large- DF
zombie attack- Tramontina Bolo
curiosity- Wilkinson Sword CSK survival knife
I probably need a Busse at some point.. (anniversary SH maybe??)