First Plasma/LCD purchase ever - a few questions..


My budget is under $1k and considering 37" - 42" sizes.

Any issues buying from Best Buy?
Any issues buying open stock/demo to save $$?
BB salesman told me I need to have the TV professionally calibrated on a regular basis. Can I DIY this process instead?
Plasma and LCD - does one require more maintenance (calibration) than the other?
And of course, the salesman wants me to buy the top-of-the-line warranty service. I've never ever bought any extended warranty on anything in my life. But is this, or any costly service contract, necessary for these TVs (plasma/lcd)?

I'd be happy to hear about your experiences related to these questions.

Thank you (in advance).
rockadanny
Regarding extended warranty: I tend to agree somewhat with Chadnliz BUT I was recently faced with the reality of getting a quote on a big screen tv repair and it was bone chilling! I considered the extended warranty cost of $100 for three years on my new Sony big screen and decided it was worth it. That's only $33 a year for in home service and peace of mind. A service tech charges anywhere from $90 to $150 just to walk into your house and then parts are over and above the service call. Bottom line it's an insurance policy, or as Chris Rock would say "in case shit happens"
Bought my Panasonic 46" Plasma at BB for under $900. It was the demo and the last one in the store. I believe there was an updated verion just out with THX but I can live without it. They tried to talk me into a warranty I said no thanks. It's been a couple of months and I very happy with it. Went with their Blu Ray as well.
Wait on new Samsung OLED soon to be released. Better resolution, thinner, and uses less energy. May be the new standard making plasma and lcd old tech.
Thank you all for your ideas. Unfortunately, an unexpected cash crunch has postponed buying anything right now. I'm even considering down grading my awesome sounding 2-channel rig just to generate some cash for paying bills. A great amount of effort was invested building this system - the thought of dismantling it makes me sick. Anyway, it will be quite some time before I replace the old tube. Bright side: by then maybe OLEDs will be affordable. ;^)