Hey everybody! I'm gettin ready to buy either the sony kp-51ws510 or the kdp-51ws550 and I can't decide. I have dish network and a dvd player that I will be hooking it up to. Is there really any picture quality difference between the two tv's b/c I can't really get an answer from anyone and don't really have the extra money to spend on the 550. Any input would be greatly appreciated!!