I put in (4) Polk Audio DB 651's in our Maristar with a JBL amp. Huge improvement over stock for very little cost. I was pleasantly surprised as was our teenage son.
Edit....just reread your post and saw your rears were 6 x 9. If you want to have them all the same my above input is of no value.
Last edited by LaRue; 10-30-2012 at 12:33 AM.