Which 3D printer shoot I take ?

Hi !

I'm completely new to 3D printing, but I have a friend who have 1 already and I love it.
Right know I will buy 1, but I did not know witch one. Can you guys help me a little bit ?

Important

- The max length must be 20cm of the object. So 20 x 20 will be fine.
- I will like to print with ABS or other strong material, because my plastic parts break fast.

The one I like the most right know is : Vertex K8400. But everywhere I hear how difficult it is to print with material like ABS. Maybe there is an 3D printer who have no problem at all with printing of ABS parts.

Who can help me ??