PurduEE:
Too true.. Let us know how your search is going in finding a local dive shop that's a dealer for Zeagle, Atomic, Dacor, Cressi, and Aeris - just in case you need service and don't want to stick it in the mail or have to deal with multiple shops.
I learned this the hard way when my local Mares/Zeagle dealer went under... Zeagle stuff goes to one shop, Mares to another... It'd be even more fun with 5 different brands..
I don't really see why he would need to find a local shop that is a dealer for all those lines... When someone buys a regulator setup from us - we do annual service for $39.95 and parts are free for life. And as far as covering all those brands, the only thing he really needs to concern himself with is the 1st and 2nd stage - the Atomic. A dive shop does not "service" a computer... I did work for a lds here in Dallas that did... would charge a customer $60 to replace a user changable battery - it's what inspired me to open up my own shop and treat people right. If the battery goes out - you change it yourself - it the computer craps out - it's not like a LDS is going to pull out a soldering gun and swap some chips... it's getting mailed back to Aeris.
As far as the gauge, what service should it get? The only thing is if you want to change out the 2 little o-rings on the HP spool - and they are #3 o-rings whether the gauge is a cressi, atomic, dacor, mares, genesis, etc...
Same is true for a BC. The only thing that could possible need service is the power inflator - and they are all about the same... a few o-rings and a Schrader valve.... And life time warranty handled by the manufacturer.. Again - I don't know of any LDS that re-stitch BCs...
There is no problem mixing gear, in fact, I'd argue that most times you should. It is hard to believe that one manufacturer spins out the best Regulator, and also makes the most comfortable BC for you that has all the features you want, plus makes the dive computer that has the features you want at the price point you want etc.
If that was the case, no one should buy an atomic regulator (tested repeatedly as one of the best on the market) because they don't make a BC or computer. Don't buy a poseidon reg - they don't have a computer either...
And when service is needed - $39.95 and we turn regs in 3 days in house - and for this customer - he is 1 day shipping away. While I know of a LDS here in Dallas that will charge a $50 rush charge if you want it sooner than 10 days! And their rate is $89 for a rebuild plus over inflated parts prices...
So really, mixing brands, either with us, or with one or multiple dive shops is really not a problem - Get the gear you want with the features and price point that fit your needs.