As far as I can work it out, this is how it goes:
V1: Old version, unavailable now. A decent first attempt, but had some major flaws.
V2: Perhaps available, but not easy to track. A good replication, but subdial border is too deep and broad, CG is poorly machined and doesn't fit the case well (even inhibiting chronograph functioning), and the "10" in the 3 o'clock subdial is printed in a serifed font (whereas the gen is sans serif)
V3: Available now. Overall, fixes the subdial border and "10" serif problem from the V2, but the CG is visually off (looks like a D).
http://puretimewatch.com/product/pam253h-v3-on-rubber-sport-strap/
Best/updated: Available now. Includes the subdial and "10" serif fix as per V3, and also has an updated CG that no longer looks like a D. Perhaps this is the V2 with updates?
http://puretimewatch.com/product/pam253-regatta-best-edition-updated/
Have I got this straight? Looks like the best buy right now is the updated V3?