One computer to consider:
View attachment 478123
It's perfectly functional for recreational diving and has a larger than standard text size and big buttons. Affordable also
Suunto Zoop Air/Nitrox Wrist Computer
While it's good to own regulators - make that a lower priority as yiou'll have routine service requirements to keep it in warranty. Plus they're basically the same for rec. diving.
Tanks also - besides the cost to fly them - which no one I know does - you also have regular inspections, a 5 year hydro test and steel tanks need to be tumbled periodically to remove inside rust. The price of the tank itself is actually one of the cheaper parts of owning them. You're right that they only make sense if you do regular local diving - many shops charge almost the same for a daily rental or for a fill,
an instructor is not going to want you using a GoPro during class either as it's a distraction. When you get to that point some of the off-brand clones have the same video quality for much less money.