It depends on how you will be using the cart, what your skill set is, what is in your toolbox, and what your budget is.
Do your research and make sure you know what you are getting into. There is a great difference between the Gen1(00~04) and Gen2(05~14) cars.
Learn from the adventures of others. Many have been tempted by the lure of cheaper(even free) early cars. Here is a good start: