You wouldn't really need anything for the rear, it would just level out the truck. You could go with blocks, shackels, or deaver add-a-leaf(AAL) for the rear. The little bit of lift in the front would allow you to clear more agressive tires.
Check out prgproducts.com. I would say you may get hooked if you stay around here too much longer... It's a disease with modding trucks.
To what frontyfan said, lifts do not decrease gas mileage, the tires do. Spacers are nice but the shocks are better, they don't decrease space between your coilbucket and upper control arm. For mild offroading it is my opinion shocks are better than spacers. Spacers aren't worth it when there are better options... Just my 2cents