Considering your requirements I would go for a zoop or a puck pro. I personally like the puck pro as it does everything 99% diver will ever need, including nitrox and gas switch.
It also has a very durable glass screen (better than the cheap plastic that you find on similar category), is big enough to be readable in all conditions, is virtually indestructible, and is the cheapest option out there...
It also has a very durable glass screen (better than the cheap plastic that you find on similar category), is big enough to be readable in all conditions, is virtually indestructible, and is the cheapest option out there...