Best value for money aquanaut/nautilus?

I’m looking into getting a patek sports watch (gray obviously).

What reference would you consider has best p/p? As in the 5167 is around 70 and 5168 is 90. But I would rather pay 90-100k towards a nautilus instead of an aquanaut.

I know these things are extremely subjectice but i would like to hear opinions.

Also i would like to see and compare market prices. Is there such a site?

Thanks!