[cleszkie]

From my experience, if you plan on taking the Blazer off road at all, go with a 6" lift. Otherwise, you will get rubbing on the front fender during full lock turning and minor compression. If cruising on the street is all you do, a 4" lift will clear the tires.

If you want a softer ride than most 6" spring lifts will give you, try Skyjacker "Softride" springs. They have more leaves per pack, but the leaves are thinner.