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I like the older SP 2nd stages quite a bit more than the current ones. I would suggest getting a 109/balanced adjustable, just make sure it has been updated with the current poppet/seat/spring/lever. Couv does a great job restoring these regs. There is a good reason why so many people are still diving with them 40-50 years after they first came out. They are certainly the most freeze-resistant SP 2nd stages, another benefit if you're in 40F water.
If you are dead set on SP, this article can provide a bit of insight to S600 vs G260.I dive in the Pacific Northwest where the water temperature can get into the low 40s. I am leaning towards a Scubapro MK17 Evo first stage, but I am suffering analysis paralysis on the second stages. I need to pick a primary (S600? G260??) and then something else which can be cheaper and less performant for a backup. Cost is not my first concern, but I also can't say price is no object.
If it matters, I do use a long hose setup with the backup under my chin, and I will take the setup to the tropics once in a while--no plans to maintain a second set of vacation gear. I'm used to the funny looks I got with my old Dive Rite cold water gear on cattle boats.
I dive air normally and nitrox on vacation. Typical recreational stuff, nothing exciting.
I guess I don't have to stick with Scubapro for everything, but after chatting with my tech it certainly sounds like a safe bet. Open to any ideas you may have.
You did not mention that you're selling the G250V.Shameless plug begins...And I just happen to sell the full conversion kits new stock OEM parts including new orifice, spring, .141 curly feet lever, s-wing poppet and long crown X type balance chamber. Message me if you want one. Cheers.
You did not mention that you're selling the G250V.
Go with the g260. It is a much better in the way the parts assemble for the balance chamber.
The G260 has a metal balance chamber that screws into the barrel. This helps keep everything aligned in a far "superior" manner as I see it. The S600 just has a crummy plastic chamber that is kind of junking held in the a plastic C-clip. If I apply pressure to the S600 knob in a tangential direction I can actually mess with my S600 tuning.As compared to what? In what ways? Cheers.