Besides the notorious head gasket, test the climate control, and make sure the AC compressor kicks on. If not, thats probably going to cost a bundle. Check out the suspension components, with careful attention to bushings, front and rear. Make sure the sunroof works, another expensive fix. Other than that, pretty reliable car.
93 300D 2.5 Turbo, Black/Palomino 273K
09 E350 Black/Black 41K