Cost of going higher?

I have the RE 3.5" Super-flex (full leaf pack) and I would like to get another 1.5 inches. What are my recommended options? I am trying to get an idea of the cost. This lift kit seems popular here so I am sure I am not along.

Thanks

longer shackles in the rear and coil spacers up front

there is of course the obivious choice...

everything that the 4.5" includes that the 3.5" didnt-

RE 4.5" Springs
RE 1.25" Shackles
RE SS Front Brakelines
RE UCAs

that's assuming you already have an adjustable track bar. also if money is a concern you could get spacers for front rather than new springs. if you don't have an SYE already than youll want to do that too.

might need sye kit / driveshaft