Looking for first Panerai

[Jroe]

Longtime Panerai admirer here. Have a handful of Rolex that I wear in rotation, but have been wanting to add a Panerai into the mix. Have some newbie questions:

Is there a "quintessential" PAM that one should consider? In Rolex speak AKA Submariner, if you catch my drift.

In my limited exposure to the models, I do seem to like the PAM 104. It has the date and seconds function which I find useful. Retail is $7k, I see pre-owned go for the $4k range. How much should one expect to get one from an AD for? Is there a standard discount people are receiving on a new one?

Anything to consider on new vs. pre-owned models (updated movements/features/etc.)?

Thanks guys!