Wulf, if you play an archer (As I recently did) you will find out how necesary precise shot is. As it is, there are only a few on the top of my list, and since I can only vote once...it still has to be
Two-Weapon Fighting!!!
I mean it doesnt sound like much, but in my experience, the -4 makes a big difference. But if it makes you feel better, I dont think it does enough and is on my list to axe. I just like to work with the top of the list first.