Depends on what you want to do in the long run bud, if it's going to be a street car leafs will be good enough, ppl here have track cars still with leaf setup, im building a 1200 coupe for the track and will still run leafs, if your going to have BIG power and so on then I'd may e spend the extra and do a coilover setup in rear! I've looked around and some ppl leave one leaf in to locate diff and go coilover shocks which would be a cheaper way rather than 4 link!
But really up to what u want at the end of the day