I like the Computech stuff, in fact I like it enough that I'm currently a dealer for them. Most of the better systems are comparable but some of the software for the different systems makes the data more difficult to read. If you can, try to download the software for the system you are considering and view some sample runs. You can get the datamaxx download here.
http://www.computechracing.com/Downl...taMaxx621s.exe
There's a sample run included with it. For me their software is the easiest to understand and use. Data is useless if you don't understand it.