I have to admit that it just sounds weird to me that people would think about buying cheapo regs every few years to avoid service costs.
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here is our parts and service kits for apeks and we ship globally for just 9.99 O-rings for Apeks gear from ScubagasketsApeks is also my suggestion. DS4 or DST with XTX 50 2nd stage.
Only if the OP can get his hands on Apeks 1st and 2nd stages service kits. Apparently not that easy in USA or even Europe.
OP seemed to have no storage space for a tank to do self-service on their future reg set, so AL19 seemed small enough to store and still be useful beyond reg servicing. Using a rental tank to do the last bits of service seems more practical though.Since the OP is in the US, the most overlooked tank is the old steel 72 (2250#). Just by letting people know I'm a diver, people have dragged out and given me those tanks that some relative used decades ago and have been lying around. I haven't had one fail hydro yet. I've given some away to new divers because I can only use so many.
And they aren't bad for local shallower dives.
At the level you are diving, it is highly unlikely that you will be able to notice any breathing difference in any of the regulators you have listed provided that they are serviced and tuned properly.
I would recommend getting a sealed diaphragm first stage, if anything because they are easier to keep clean with intermittent use in the salty stuff. I would avoid sealed pistons as they are expensive and annoying to seal *likely an extra $50/service to reseal an Atomic as an FYI*.
I would go with option 4 and get a @Deep Six Signature. You're in for $800, but you have a regulator that breathes as well or better than your Option 1's, BUT it includes the first service for free including parts, so that saves $100 just in labor for you. It has a 2-year service interval, so at some point in the next 4 years you can opt to take the service course. The service course is not required and won't void the warranty, BUT it gets you a free parts kit *you pay shipping* every 2 years which is unique to this brand.
This gives those regulators the lowest cost of ownership in the industry and they are VERY easy to service. Buy an IP gauge and learn how to use that and listen to tell when they need service, send it in for the first one, and you have 4 years to figure out if you want to DIY or not.
I can get them cheaper in Hong Kong.here is our parts and service kits for apeks and we ship globally for just 9.99 O-rings for Apeks gear from Scubagaskets
This is really smart, why didn't I think of it
I have to admit that it just sounds weird to me that people would think about buying cheapo regs every few years to avoid service costs.
Guys stay away from Italian carswhilst most cars, nowadays, are designed for self destroying after 5 years or 100,000 km, which comes first.