Why not build a custom rear pack. You can at let achieve 4" there, add a lift shackle and call it good. Get a set of 4.5 coils and a spacer or get 6" coils. Then spend money all that saved money on some good control arms and a good adjustable track bar and HD mount, not the rough country junk. I'm sure if you find the right donor leaves for the rear you'll spend around the same amount of dollars and get a much better lift.
Also you can just do some surgery and trim your fenders and add bump stops, Even with 3" you can fit 33's and if you only go to 4.5" 33's are even easier to fit. That route would be the Cheapest, way under $650.
Then you can spend your money on what is really important, like gears and lockers.