ScubaRon:
Officially you don't as ScubaPro USA does not offer warranty on any product not sold face-to-face, regardless of whether the dealer is authorized or not. The question of course is if they will find out...
Plain and simple, Scubatoys will not ship any scubapro items, even if you purchase it in their store during a layover at DFW and don't have the time to wait for delivery. I checked just two days ago on a pair of jet fins and this is what Larry told me. On the other hand, and not to advocate for Leisurepro, their warranty is as good as Scubapro's, so it's a toss up. Personally, and with the exception of my jet fins, I believe scubapro products are grossly overpriced. But that's just my opinion.
You can also order from Simply Scuba in the UK and get an even better price than LP and full ScubaPro warranty. The only hitch is that you'll have to mail it to the UK for service and I am not sure if the free battery changes apply outside the US.
Not only that, you also stand to have to pay import tax; not worth it.
Personally, I dive with an Aeris Atmos 2. I am enchanted with it and regarding the issue of conservatism, IMHO, the issue of whether one computer is more conservative than the other is a moot one. A responsible diver will not dive based only on what the computer tells him/her. A responsible diver, again IMHO, should know whether to end the dive, even if the computer says he/she can stay down longer.
Also, my preference is not for an AI computer. In the unlikely event of a failure underwater, I would, at least, like to know how much gas I have in the tank. Of course, there are ways of estimating your gas consumption, but who remembers the formulas when they're not used continuously?
My preference is the wrist mounted Atmos 2 with an SPG for the tank.
Semper Safe,
Rick