I had a Rough Country add-a-leaf up front, HAD! The instructions said to put it in between the two, that BOWED my spriings at both ends, when I put it under, the add-a-leaf made a "W" and dug into the lower spring. Straight a$$ IMO. The lower kit looked the least offensive. Yes offensive, I wouldn't use either one.
I've seen guys clear 35s with a small lift, but it was on an 8" rim. Unless you like riding on the center of your tread, get 16x10s. Just because a tire fits on the rim, doesn't make it the right rim. Of course 16x10s mandate a 4 to 6 inch lift. Now you need shocks (nitrogen shocks are pretty stiff on road), a track rod drop bracket and a dropped steering arm. I even put a 1.5" spacer between my frame and bumper for tire clearance turning.
Regardless of what lift you buy DO NOT STACK BLOCKS! I don't care what they are selling, its dangerous, I've seen stacked blocks spit out. I ride on Pro-Comp springs, 5" front and 6" rear. I should have bought them in a kit, but that's another story.