Welcome to our fine forum. As to pure, functional and dependable dive watches: Citizen Aqualand Pro series. I've owned two, the second one a very elaborate watch with a docking station to download diving data (depth, duration and temperature). As to high quality and elegant design, the Orient Pro Sat and as to a wide choice of dependable and affordable divers; Seiko. Mind you: completely in-house, like Orient.
Orient OS300 SAT PRO I own this w/ black dial
Orient Beast, especially vintage
Orient M-Force Air Diver
Seiko Samurai (own)
Seiko Monster (owned)
I would like to get Orient SAT PRO in white dial, and Orient Beast vintage.