Well at the moment I'm focused on my generation (91 Burb). I'd consider a newer one, but mine is working so well right now.
If the time comes and the engine dies, I would possibly consider swapping in a Vortec motor from a newer burb. Then the decision would be to use the 4l80E or the newer 4l60e. I suspect either selection with the new computer, might net me some better gas mileage. I'm not sure though.
As for the Airbags, I was definately thinking of them as addition in helper mode.
I don't haul heavy loads all the time, but it's nice to have the extra capacity when you need it.

. If I could make my 1500 into a "2000" or something with some mods, I'd probably be more than happy.