Small lifts for el silverado

hey fellas, i recently purchased the appropriate ford Torsion Bar keys, have not installed them yet, but i understand that they give about an inch and a half lift for the front, essentially making the vehicle level. My problem is that i still want that factory slant where the back sits higher than the front. To accomplish that I want to upgrade the leafs on the back of my car... so to anyone that has done that or knows someone who has, i am lookin at a Hellwig add a leaf kit (http://www.truckperformance.com/products/?productID=582003) ~ check it out there, that is gonna cost me roughly 80 bucks... is that a good kit??? is that a good price??? is that gonna accomplish what I am lookin for??? ... they say that those helper springs will lift the back end up about an extra 1.5-2 inches. So any help would be appreciated... thanks!!!