I'd start w/ pulleys and a timing adjuster. Then decide if you want to run long tube headers which will require a shorter mid pipe. No need in buying one mid pipe now and another later if you go w/ LTs.
i think you should probably get the pullies, but a good off road x or h pipe would do wonders for your car with 6 CATS. if you want an off road pipe, i think you should go down to the parts dept at Kimnach Ford and talk to Jim about getting a prochamber.