Any chip can be used to tune your vehicle basically. There are some out there that only the parent company can reburn. For instance Superchips, Hypertech sells off the self programmed chips that are not actually custom programs, the same with some of the other companies. These chips can not be reburned (reprogrammed or tuned) except by the company. I would stay away from those.
You have SCT and Diablo who provide chips to their dealers who can build you a custom program for your setup and these chips can be reburned as many times as needed. I would look into finding a dealer in your area for this. You will also want it dyno tuned to get the best and safest programming. You can not use any type of handheld device since your processor is an EEC IV with a non flashable ROM chip in it.
The moates is also a excellent choice if you are doing your own tuning. They are much cheaper than the larger companies also. But you will need to also purchase tuning equipment to work with tuning your vehicle. Most importantly would be a good wide band O2 system to monitor and record you air / fuel ratio.