It depends on what you want from the car..... If you are happy with a stocker then settle for that,however if you plan on modifying the car you can save a lot of $$$$ by picking up a modified one that someone has thrown the $$$$ into already.His loss & your gain! You will find stockers with log books & low k's that have had a hard life.Then you will find a modified version with lots of k's that has been well looked after There is no real set of rules with picking a used car.....You just need to take each car on it's own merit.