This is an opinion and I have no problem with it... I disagree depending on the diver's wants/needs
ianr33:
IMHO non air integrated is the way to go.
These areas however can be quantitatively measured and discussed
Air integration just adds cost,complexity and failure points.
They are more expensive, but your getting additional value
They are a little more complex, but only the addition of a pressure sensor and a little software (and transmission bits for the 'hoseless' models).
Failure points, may actual decrease depending on design and this kind of statement requires some factual backup.
Remember when divers didn't even use a SPG...
Sometimes the cost, complexity, and failure points are worth it
Grumpy
I view air integration like I view calculators... You should know how to get along without one, but they can be handy tools. And recall your NDL have nothing to do with how much gas you use, it's only time and depth.
I think it's great your diving and supporting your sons. Since your likely buying multiple units I would talk to shops about buying/trying some rental gear. I don't think everyone needs the exact same computer (pros and cons), but I would only look for a Nitrox model, preferably one capable of "gauge mode". Skip the integrated compasses in favor of a wrist mounted SK7.
I have a Oceanic DataMax Pro Plus (2000), a Suunto Cobra, and a few SPGs. I like AI because I can use software later to accurately determine my gas consumption rate for the dive. I also like that the computer has alarms for turn & end pressures, but the alarm should be a backup to regular gauge checks. I think it's dangerous for divers to let the computer do
all the thinking.
When you think you have decided on a model do a search to make sure you're not missing something.