You are hitting the high notes of the base collection . One Luminor and one Radiomir. You can't go wrong with either. The 177 I guess was possibly a limited run. With the 183 the are different millésimé where you find the blackseal name on top or bottom. My favorite version is on the bottom like a G series.
I put some pics up of another option the PAM 176 which also has the brushe titanium but no sub second dial or the word marina on the dial. So it was just for contrast.
Really you need to see which one sings to you first as this passion is addictive and you will surely jump on the second very quickly.
Bill



