A lot of people will suggest either the 111 or 372 as good "gateway" models that have classic DNA. It really comes down to personal preference, but I would take into account size (case diameter), functions (date, seconds, etc.) and use (dress, sport or dive). If you can narrow it down to say a 44mm dive watch or a 47mm dress watch with small seconds, then your search will be much easier. What has caught your eye thus far?
pam372 for the 47mm, or a pam111 for the 44mm.
...or just go straight for the pam382
With a suit, you can get away with the bigger watches (some of my previous posts illustrate this quite well haha), but if you're looking for a more traditional dress watch, then I would look at Radiomirs (no crown guard and in general, thinner than their Luminor brothers) or the new Due line of Luminors. Despite the latter getting a bit of a bad rap, they present well and accomplish the look of a PAM without lugging around a brick on your wrist.
After looking around, the Radiomirs seem more my speed! Many thanks!