First of all, I've already checked out the spring rate table here at CK5 and read A LOT of posts about ride quality differences between the various brand names out there. I've come to the conclusion that BDS and EZ-Ride are the lift kits of choice if you want to maintain a somewhat smooth ride. HOWEVER, due to the fact that I'm in Canada, some brands are easier to get and the difference in price between brands is definitely going to limit my choices. The guy I'm dealing with is going to get back to me tomorrow with a couple of more options but right now I'm looking at either a Skyjacker or Superlift system(both 4"). I need some honest opinions on ride quality of these 2 brands(Opinions on other brands are welcome, too). Keep in mind that this truck is a daily driver/family vehicle. I'm also curious to learn about how much these springs sag after awhile. I don't want to have to replace springs in 5 years.