Bigred, I would like to offer up another option.
http://www.rpmperf.com We use and sell these systems on our bracket cars and an A-fuel car we are associated with. Very easy system to use and Randy the owner is very easy to work with.
You can see their add in the back of National Dragster. I'm sorry I don't have experience with Racepak although I know they are top of the line. Altronics on the other hand we have one of their older recorders. It worked well for a while but when we had problems with windows compatibility it was not a good experience working with them. This is just my experience and their recorders may be great now. Good luck with your purchase.
Curtis