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If i were you i would go with the Apex i have been using my ds4s for 8 years and never a problem i have not exactually been up to date on servicing either (didnt have them serviced for 4 years until i serviced them myself). I have serviced the 200's and could not believe the machining in them compared to other regs.
I have used and serviced scubapro regs they have a lot more parts than apex in the end having more failure points. Ice diving the reg that freeflows 90% of the time is always scubapro so i would stay far away from them for cold water diving.
As for the zeagles ds4 equivalant i have a friend who used one on a stage bottle and the thing actually blew apart underwater causing him to have to switch regs on his stages underwater flooding both first stages and quite a hassle. If they did not blow apart i would possibly use these. The reg was fairly new when it blow apart if you were wondering if it was abused or not serviced.
For the Atomic regs i do not know much about these other than they are quite pricey
Cédric RATHGEB;3607746:Hi, in swiss' lakes even during the summer water at 40 meters (131 ft) is rarelly over 6°C (43°F), and during the winter you can enjoy diving under the ice in a water arround 3°C (37°F).
Here's my top list of high end regs for cold water (based on what I tested / I'm owning) :
- Poseidon XStream
- Apeks XTX 100 - 200
- Aqualung Legend LX Supreme
You can definitely exclude Scubapro of this list
You can get a Z2 setup from LP for $415. The M1 is on sale for $500 and is made for cold water/tech type diving with an env. sealed first stage.
I don't think you can beat that without a significant compromise in performance. Keep in mind; Atomics require service every TWO years, not ONE year as with most others. This means you'll save ~$100 after the first year (no, I don't work for them or any other equipment seller).
How ya gonna beat that?