Didn't Doug Fortin Jr. win Parker in a 20 year old car? So it's not what, but who, maybe? It's already been stated, there are lots of good products out there. Find something you like, and learn to drive it.
The Alumi Craft's have been awesome as of late.
Lots of great cars out there from all makers. I got mad props for RACECO too. JimCOs are killers.
Setup, Prep, and driver are the bigger factors in my opinion.