What is the application? The Terminator X stuff doesn't have lots of room to gather extra data. I have never used one but they seem to be a good system but they are priced so well because they lack alot of features.

Speaking from experience if you want to data log stuff for a race car you will at some point want to gather more and more information. Something like the Dominator that has loads and loads of room for inputs is more suited for a full on race deal in my opinion.