spindles up front or drop coils.
If you go with spindles 17+ can get pricey but you must run bigger than a 17 inch rim.
16 spindles are normally around 100 bucks. You can run 16 inch rims or bigger but you lose turning radius.
If you go with coils run DJM coils for stiffness and Belltech for more spongy ride. Either way you shouldn't need a coil compressor. After the few trucks I have dropped I never needed one. Just lay under the truck and push the coil with a long screw driver or something at the bottom.

In the rear since you have a extended cab i would do hangers with you shackles that will give you 4 out back.
Removing the factory hanger on the driver side you must drop the gas tank that is the only bad part.

 

I have an entire lowering kit for sale. It is brand new. It includes 2" lowering springs in the front, 2" drop shackles and 2" drop hangers in the rear. It runs $499 shipped for everything.