For flexibility and joint handling, right out of the box, V4 is IMO the best.  For a male figure, Apollo Max has to be the best and best of all, it's free.

A lot of people don't particularly like V4 but I suspect that a lot of it is because it's a relatively new figure and - to be perfectly honest - out of the box she looks pretty bad.  Don't let that put you off, though; the figure is well worth persevering with.

You may also want to consider getting the free version of V3, which doesn't come with morphs or textures but will give you a start on a new figure.  It's no longer available at DAZ but it is still legally available elsewhere.  Sadly, I can't remember where but I'm sure someone here can point you in the right direction.

Poser 7 -which I don't have - has a morph brush which apparently solves a lot of bad joint issues.

Coppula eam se non posit acceptera jocularum.

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