Surround Ex. Rear spkr's

My system consist's of Paradigm Mini Mk III's, CC-300,ADP-150's. What do you think would sound the best for rear center? Two mini MkIII's or another pair of the dipoles ( ADP-150's)? I would rather buy one or the other not both.
The recommended rear speaker for home theater use is direct and that is what I use (dipole side, direct rear). Which receiver/processor do you have?
I'm using an EAD ovation.I plan on getting an out board rear surround processor.EAD has plans for 2001 and surr. ex.