I just bought a 40" samsung from amazon and had no problems. The shipping went smooth and got here very fast( less than 1 week). We took it out of the box, plugged it in, and had no major setup. We have cable and just ran an initial setup for channels and had it going in about 5 minutes.
It was very easy and the tv is great! As far as best buy, I believe the set up with Geek Squad is an extra charge. I tried to get our local best buy to do a price match but they will only price match actual stores within 50 miles. Since we have nothing within 50 miles, I went with amazon. I couldn't be happier!