I only have had experience with two kits. One for my 1983 Chevy Truck, 4" lift that was about $250, I think it was Ranchero.
And now the Rough Country 4.5" lift. It too had everything needed to do the lift, plus great customer service. The only thing I don't like about it is my fault. I bought add a leaf to keep the price down. I didn't want to but I didn't have the cash to get the replacement leafs. I will be buying replacement FULL leaf packs from RC pretty soon.
I've been running the lift for little over a year now, love it.
Other than the leaf packs, I am planning on getting the upper control arms, and possibly the drop brackets, all from RC.