I've just taken delivery of my new Sharp Aquos 1080p 52" LCD. At the same time, I also came across an article on 'HDTV calibration by ISF qualified technicians' in the latest issue of Sound & Vision magazine. Is the pumping out of an extra few hundred dollars to do the calibration necessary and worth it? I was told by the salesman whom I got the Sharp from, the factory default setting is enough to give me an excellent picture. Afterall, he said, my HD program provider is not currently broadcasting 1080p signal and I don't own a Blu-ray or HD-DVD set.