To take a break from the bruised egos for a moment. I got new regs in 2003. I did not know what to get as i had been out of the water for 20 years. So i went to reodels for some comparison advise. All the brands today were new kids on the block when I started in the 60's. I made my chiose based on a spec about how deep can you go before the reg starts breathing hard. The scubapro mk25 and teh s600 cam out on top at 200 ft plus. So i bought it. And hae never regretted it. I got it from leisure pro for 450. Not a lot of money and boy what an air supplier it is when you need it. I now have I thnk 5-6 of them. Also as a factor was that the lds sold SP and could/would service it. Some Atomic regs have a recommended service interval of 2 years. The other brands are 1 yr. I agree with intended idea of an expensive reg doesnt mean it will perform better. but certainly a cleap reg will perform worse. warm water , cold water, I think hog regs are pretty reliable and simple so you can fix on the shoreline with little effort. Heck take it apart under water and reassemlbe. Absolutely go with an established maker that will be around a while. Bypas DACOR. Remember when you take it into the lds tell then you got the reg as a gift from an out of town relative so he wont feel cheated out of a sale.
Good luck
Good luck