yup i have the same issue apparently its cause of the tv drawing lot of power dur to its fast start up . try plugging it in to the wall direcly ie with no other devices plugged in. i also notice that it only happenes if i have had the tv off for a while eg over nigt and not if it turn it off wait a few mins and turn it on so it must be some thing with the power. i would still call samsung and see whats up.
No. Check out cnet.com. For overall picture quality, the b750 rates higher than any other tv including the new samsung LED's with the exception of the samsung 950 and sony xbr 8 which offer local dimming, but these two sets are extremely expensive.
Word is that it is no longer on the site because the new models are supposed to be released soon.
I have been watching the price for a while too, and Amazon's is about the best at the moment, though you can watch Slickdeals.net forums for new deals.