Just save up your money and get what youw ant and use the "less than new ride" as an excuse to get the lift you really want
Since I can't afford the 6" I'm going witht he 4" Way cheaper plus I can keep my 33's without looking retarded. and a Fraction of the cost...
But if your set on 6" I would just save up and get what you want... If you have to replace what you have get some get some billsteins, should be enough to tide you over and alot cheaper so you can save the extra money towards your 6" without wasting it.