Having made render tests to check these dolls for suitability, I found that the P2 Lo-poly dolls were pretty good, probably the best quality-for-burden compromise I have seen.  They have a good shape, low polygon count, and only a few material zones.
     The P4 Lo-poly dolls are the lowest in polygon count, but they are utterly horrid, and unusable.
     The standard P4 dolls are quite good.

      DPHoadley, have you tried to make a decent-looking remap of the P4 Lo-poly dolls?  I would be curious to see the result, though I suspect a good P4 Lo-poly isn't feasible;  they just aren't in the same class as the standard P4 dolls.

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5