Condition is everything.
I spent over $12k additionally on my IM getting it squared away - me doing all the labor. (2004 car with 6k miles)
My car was a car listed on Henry's site. Henry is a excellent human being, but does not know the real condition of every car he list. So be sure to have it checked out!
Later I almost bought a IM roadster with the Audi engine from an individual,but the seller was so aggressive and weird, I walked away. (even after having bought the plane ticket to go see it)
If something does not seem right, proceed with caution. It can cost you.
Having said, the right car will be a wonderful experience.
Price is not everything. :-)