DEX then Per
You need crafting for other things anyway so you might was well have your archer be your crafter so they can make arrows also.
Cool downs are reduce if you increase your Marksman skill.
To be honest, in the end I seldom used the Marksman skills except for a couple of the higher level ones. Also the special arrows were all but useless. I always did more damage with just plain arrows and anything like charm, freeze, etc. the enemy would always save against anyway, so those became pointless also.
