Pick up a copy of Grassroots Motorsports magazine; it's dedicated to road-course & autocross stuff. They have a big classified section in the back, tire tests, build-ups, etc etc.
I totally get the build-my-own line of thinking, but like (I think) Andy's basically saying, a complete used deal may be a better use of $$$. I can't recall the last time I saw a Mopar in there, though.