Hunting xbow can get by with pretty low wpf. 80-100 sounds about right.
If you keep a 0 slot weapon and 1 slot shield around, you can upgrade to light or regular xbow when you feel like changing your gear around. The regular xbow packs a nice punch and reloads at a decent speed even if you have low wpf.
No matter what you do, only make mid-range shots. your accuracy won't be good enough for long ranged sniping, and especially with the light and hunting xbow your bolts will drop before they can get that far anyway.