Good to see you like the SM300m much as i like.
The chose proses is always a good time to have.
I selected a dozen candidates from some sources, at the end my silver zirconium ended at the first place.
An UN, a Tissot, Omega, Ball, IWC (aquatimer) to call some.
These peaces where a bit too pricy, but i want to let u know which watches i considered if my budget was higher.
Blancpain FF, AP RO diver, with the AP on top as uber dive watch.