I've gotten benefits from putting good cords on my plasma monitor, cable box, DVD player and HT receiver as well as the line conditioner.
I've tried most of my audiophile cords on my Panasonic TH-42PWDUY7 and found a cryod Belden19364/Marinco cord to be the best and most definitely worthwhile.
I have read others have experienced solid benefits from putting a good cord on their projector. I recommend trying a cryod Belden 19364 cord for about 40 bucks.