There are definitely more choices when it comes to shafts for woods than
irons.
As for choices, you always want the lowest torque possible when selecting graphite shafts. The lower the torque, the less twisting the shaft will do.
As for kick point, most graphite iron shafts have a mid kick point, but you can find the odd shaft with a low kick point.
As for flex, I would suggest with your distance with a 6 iron that you should be hitting senior or "A" flex shafts.
My own personal recommendation would be the Harrison Tour Classic II iron shafts.