Daniel, how do you want to use the tool? Just for the GT? For other makes/models?
IMHO the VCM/IDS tool is way, way overkill for 99% of the people. Consider that we have probably worked on more than 100 GT's and we have never missed or longed for the VCM/IDS tool because much simplier, less expensive, multi-usage tools are readily available and work great. I would point you at the tools from OTC and you can even source these from your local Sears. Also, you may consider an SCT device which has the ability to read codes and reset the ECU and with the added advantage of having the ability to host and load a tune if that may be in your future. Many many choices out there and much depends on your intended utilization.