How tall should my ceiling be if I'm going to get an elliptical?

The problem is whichever device I get, whether treadmill or elliptical, is that it's going in the basement. I don't know if the ceiling is high enough for an elliptical trainer, as they generally seem to be higher off the ground than a treadmill.

For example, compare these two:
http://shop.bjs.com/Endurance-Commercial...6VVviewprod.htm

http://www.amazon.com/Schwinn-Variable-S...65577303&sr=8-3

Looking at the images, the elliptical seems to be much higher off the ground, and I think my head would hit the ceiling.

I'm new here.