U need like 5... SS type and a ceramic type, that's two already. Then u need one without crown guard, and another standard luminor with crown guard, that's another 2. To finish that with something special, flyback doesnt work, so no need, maybe u need a bronzo or white dial.. so that's like 5. In between, u can choose with or without sec at 9, with a mix of auto and handwind and different dial type (sandwich a must). No need of chrono?
Look thru Ale's pam guide and find which to start with.
Then u start wanting better strap, u will go for some proper cow leather, then mayb something exotic like crocodile or ostrich, then something sexy like snake skin.
The addiction will not end there, by the time you know, you are in too deep.
I have 3, and suddenly jump ship to APs~