+1 Distance Musket
, 80ft range increment, 9,800 gold.
Far Reaching Sight
, 4,000 gold.
, 20,000 gold.
Touch AC sneak attack from 800 feet away? Priceless.
( You could also just convert all your rogue talents into Ninja Tricks and pick up the +10 feet range trick every time, if the 20k gold piece pricetag makes you all weak in the knees. )