I think a used car makes more sense, especially from someone you can pretty much trust.
One thing I would do is make sure to put it on a lift and look underneath - I discovered a year later that my 2009 had been bottomed out at some point and bent/flattened one of the side braces for the aero skirt. Can't be seen unless you get underneath, so I'm not too bothered, but I would have preferred knowing before hand. I'd also check oil changes to see if he stretched an to 7k or so - I take that as a good sign you don't have to worry about the car having an oil problem (a 2010 shouldn't anyway).
A good thing about a black car is you skip most of the painting - everything is already black!
Except the door handles
