You don't have to go with disc's right off the bat, you could add them later. When it comes to the brakes don't cut corners, do them right.
There are dual reservoir master cyl kits available that bolt up where the OEM master cyl does. You could then plumb your truck for separate front and back brake circuits which would give you alittle better stopping power with your drum/shoe brakes.
Adding disc's is a pretty steep expense whether you do it upfront or afterwards. They do provide better stopping power tho....
Good luck
Dave
