Question about my Workflow with Xnormal and Maya Rigging process

My process is

1>Zbrush model
2>Bake High poly onto low poly mesh with Xnormal
3>With the low poly mesh that is normal mapped I will bring that into Maya to rig
4>Finally I will texture the rigged mesh in another program

I would like to ask, what is the poly count i should be aiming for with a character head up to the collar bone?