Attached Link: 3rd Gen Hybrids

I'd rather suggest the V3RR/M3RR figures.

The couple of extra polygons they have compared to V2Lo/M2Lo really make a big difference in realism and as they are exactly the same mesh geometry, they are a lot more versatile than their predecessors.  Not to mention that support is massive.

There really is no problem weightmapping a high res figure like V3 or V4, btw.

On the contrary, the 19.000 polygon mesh of Genesis for example is a big disatvantage when you try to create more elaborate sculpts. Also the necessary render-smoothing eats up any performance gain you might get from a low res figure. (Keeping texture resolution at reasonable sizes is much more effective to keep overhead low)

I solved this problem for me years ago by putting the V3RR/M3RR low res heads on a V3/M3 high res body, resulting in a 40.000 polygon "mid-res" figure, that gives me enough polys to do realistic body sculpts but is yet only half the size of the standard figures. The low res head is also great to work with for creating custom expressions.

Anyway, my point is:

M3Lo and V2Lo are great figures, but your time is better spent if you weightmap V3RR and M3RR. (Or standard V3 and M3. Or David or SP3 or Luke/Laura)

Or even better build yourself a hybrid like I did if you want the best of both worlds.