If you are going to get a chip, IMO there's only three ways to go, either dennis reinhart, fordchip, or myself. Using a Superchips, Diablo, hypertech, or Jet chip "off the shelf" calibration isn't ideal for a modified SC, and their programs don't do as much. Plus, if you need a change done to the stock program, they will charge you up the a$$.
As for the tuner, those are okay too. They cost more, and at times may not be as reliable. On the positive side, you can make minor changes like removing a little spark if you get pinging. I've tuned cars and given them .bin files to load in their tuner so they could play with them. The thing to consider with a tuner is that you can't just pick one up and tune your car. They are not user friendly. Even though there are a whole bunch of people here that do run tuners, I think almost everyone starts from someone else's file (like a Fred file) that has already been built based on their modifications, ideally on a dyno. Writing a file from scratch is easy once you have done a couple dozen, but it takes time, research, patience, experience, and a whole lot of learning. Plus without the proper guidance, you could easily mess your car up.
Hopefully I won't get flamed, it's just my honest opinion.
Brian