In the brooks in August, I'd go pretty heavy on bug protection, and lighter on clothes. For sure you want some insulation, but you don't need redundant layers. I'd go with a goretex type rain gear (lighter) as well.
I probably go way too heavy in sleeping bag, but we generally hunt the late season. I like an ice axe in some situations, but I wouldn't carry one for that location and time of year. Trekking poles will be very handy. Anti-shock is an absolute gimmick in my opinion, but I watched a buddy destroy a pair of "anti-shock" poles in a single hunt, and haven't looked at it since.
Be prepared to cover a lot of ground. If you are not going up/down or sidehilling, you will be in soggy lumpy tundra or rocky river/creek bottoms. There is some nice walking, but it will never last more than 100 yards.
