I had a super lift on my old 85 SUCKED no flex, drove like a tank
Tuff country was on my current 4runner when I bought it, they were quickly removed and replaced with alcan's.
If I were forced to go with a "bolt on" kit, I would go with skyjacker, they cost a little more but I believe they have the best spring rate.
I went with super lift over skyjacker because super lift was a bit cheaper, but come to find out superlift lifts do not come with bushing
So I had to spend the extra money anyway.
If I were you I'd save my penny's and hold out for alcan's, as you are already experiencing you feel you need for a new lift, if you purchase one of these out of the box kit's your going to waste your money and want to replace them as well.