Converting MS Powerpoint files to Corel Designer 12 files

Hi - our company is stuck with CD 12 because of budget cuts.  So does anyone have an idea which format is the best to use when converting MS Powerpoint files to Corel CD 12.  The main concern is to maintain the edibility of the line art without much distortion for later use.  I have tried EMF with some success but not really happy with it.   Maybe EPS?  Any thoughts would be appreciated. 

Thanks, jim