i guess it depends on what youre going for.
if you want a natural, well articulated body for good posing, nothing comes close to Takara 2.0 (especially for skin tight clothes). i mean, really there is no substitute. but it comes at a huge cost.
IMO the BBI PB and all derivative clones do not look very natural in a skin tight wetsuit and posing ability is limited, although some people have been able to modify them to look better. but this would be the most cost effective, as it is very easy to score a PB type body these days.