We can do basically the same kit as that one for you, at the $1,395 price. Instead, we would go with a 3" Street Edge spindle to get you a tad lower, Black 444C and a 5 gallon tank instead of the 2.5 gallon.
I would even substitute the DeadEnd Garage notch for you, which gets you a tad lower in the rear, but allowing the bag to mount directly to the frame. This notch has an integrated bag mounting area, and a panhard bar mount included.
http://www.azproperformance.com/Dead...63-72-C10.html
It is basically taking out Budget kit and adding in the above notch, panhard bar and spindles.
http://www.azproperformance.com/Budg...63-72-C10.html