I bought my Samsung LCD at Best Buy and paid them the $300 for a calibration. In addition to the calibration, they told me that the guy would be able to go into the TV's settings and reduce it's power consumption. Sounded good to me.
Well after setting up the appointment, the guy calls me back a couple of days later and says that he can't get to me for another 3 months!! No way was I waiting 3 months for a calibration. So I got my money back and called some local people to get estimates. Most people were just charging the ISF standard $250 for a calibration, but some people charged more; one charged as much as $450!! I'm not sure what makes his calibration $200 better than anyone else's.
Anyway, before the calibration, I set my TV to the specs that were given for my TV on the AVS website. When the guy came out to calibrate, it turns out that my TV was already about 85-90% of the way to being properly calibrated. He just tweaked it that little bit more to get it all the way there.
The TV looked good, but right off the bat, the TV was MUCH darker than it had been. So much so, that it REALLY bothered me. Dark scenes tended to just look like a black screen. I turned up the gamma a bit to lighten things somewhat without getting too far away from the calibration settings. It took a few months of getting used to, but now the darkness doesn't bother me. I guess that's the way things are supposed to look.
So what am I trying to say? I would say try a test disc out first, or check AVS to see if they have posted settings for your TV. Was spending $250 for a calibration worth it to me? Meh. I guess.