There are plenty of performance computers on the market today which range in price.
I currently run an accident reconstruction consulting business and use the Vericom VC3000PC. In my business, I need the most accurate equipment for testing vehicle braking and acceleration performance. Otherwise, I probably wouldn't own one at $2200 a pop.
Although the VC3000PC is expensive, it is probably the best performance computer on the market today.
If you are doing some serious testing and know of a few others who would be willing to chip in to purchase one together, this is the one to buy.
It will allow you to determing braking performance and acceleration performace by distance, time or speed (user program).
Hope this helps?
Reade