Not all diving watches are created equally.
Tag Heuer's offering of a more wallet friendly automatic diving watch, with a ceramic bezel, is the Aquaracer Automatic Chronograph [cay211b.ba0927]. In Tag's lineup, it this watch straddles the gap between the entry quartz aquaracers and the 500m Automatic Chronograph Aquaracers (which have more than a passing resemblance to the Omega Seamaster 300m Diver Co-Axial Chronograph 42mm watch collection).
Theres simply no way around the fact that this watch is gigantic. The ProDiver has a huge 51mm case diameter and is nearly 2cm thick - definitely not something that will fit under a shirt cuff. This watch is so large that even the big Rolex Deepsea (ref. 116660) starts to appear small when sat next to the ProDiver. Although the ProDiver is only just water-resistant to a mere 1000m with the Deepsea enduring the far more sensible and useful depth of 3900m, I think the ProDiver would be sufficient for the 99.9% of divers.