This means that the item is at an Amazon Fulfillment Center (probably in KY) and will be shipped from Amazon, not a 3rd party. It also means that there are no charges for second day delivery if you do/had signed up for Amazon's "all you can eat" Prime shipping rate ($79 annually for everything you buy that qualifies for Prime).
I buy 95% of my electronics and many other items from Amazon. I recently purchased my entire home theater system from Amazon. That included LCD TV, A/V receiver, DVD, Tivo HD, furniture cabinet for components, cables, power conditioner, etc. I researched on Amazon, CNET, and forums (avsforum.com). I installed and integrated all the components myself. My savings vs buying from Circuit City or Best Buy, and using either of their install services, was close to $3000.
Amazon also offers a 30 day money back return policy on items they ship directly.
Should you buy from Amazon? Absolutely. I have not shopped the price of your item, but you can try B&H Photo (reputable) and JR (jr.com) if you want to be certain.
From the Amazon web site:
Availability: In Stock. Ships from and sold by Amazon.com. Gift-wrap available.
So Amazon is the dealer.
If you go to their web site, and click on "Online Dealers," you'll see that Amazon IS an authorized dealer.
For what it's worth, B&H has it for 849.95, Amazon had it for 811.93, and Adorama has it, but I'll be darned if I can find a price on it!
Given what people have been saying about Amazon, I'd certainly go with it from them, especially since I do happen to have their "Prime Shipping."
Mark