How high can I take ISO settings for large prints with a Nikon D3S?

I wanted to know a bit more about this, as the Nikon brochure for the camera has amazing prints at ISO 12800 at around 11X14 or something like that.

What could someone expect if they needed to print something like 24"X36" or bigger? Would you stop at ISO 5000 for that size, providing you could reduce noise properly?

Sigma 24-70mm f2.8 EX DG Sony fit on a nikon body?

I recently got given a Sigma 24-70mm f2.8 EX DG Sony fit and have a nikon d300 is there anyway to mount it on the nikon body?

What to expect for the Nikon camera that will replace the D7000?

This year the D800, D4, and D3200 came out. Those are new versions to replace the D700, D3S, and D3100. I wonder what will replace the D7000, and maybe D5100. I think it will be called the D7100 or D8000. What do you expect the new features will be? I'm planning on buying a new Nikon body and think I should wait till new ones come out instead of getting the D7000. I heard rumors of a D600 which will be an entry level full frame fx camera.

Nikon d200 are good camera than d90?

Nikon d200 are good camera than d90?

What's the difference between these cameras?

I bought a Nikon D3100 last year just because I wanted higher quality photos than a point and shoot. I don't fancy myself a photographer even though my mom makes me take pictures of everyone because of my camera being "fancy".

But I know some people that have "better" cameras than I do. My mom was bragging about my stupid camera to these people and they pulled out theirs and were like, "Oh, well, I have a D7000… I just bought it to splurge on myself!" and this one kid who gives me dirty looks was like "I have a D800" and then he rolled his eyes. He's not even a professional photographer nor does he want to be one.

And looking at the photos from all three cameras, I can't really tell a difference. Someone told me the only difference was the kid the with the D800 can take a photo and it will have less pixels if he blows the photo up really big.

Added (1). I didn't mean to say "my stupid camera" as if I was being ungrateful. I just know it's not the best out there so it's embarrassing when she brags about it.

Will there be a Nikon update on DX format?

I want to buy Nikon D7000, a great camera, but after hearing many roomers about new Nikon cameras i'm not sure anymore they say that soon (this year) Nikon will make 3 more cameras and all of them shall be upgrades to D7000 D300 and D700 and the best of them all will be the new D600 which will be the upgrade for D700 since they say that D800 isn't the D700 upgrade so shall i wait or not? The D600 will be a full format camera with more Mega-pixels and a new processor?

Will there be a Nikon update on DX format? - 1

I want to buy Nikon D7000, a great camera, but after hearing many roomers about new Nikon cameras i'm not sure anymore they say that soon (this year) Nikon will make 3 more cameras and all of them shall be upgrades to D7000 D300 and D700 and the best of them all will be the new D600 which will be the upgrade for D700 since they say that D800 isn't the D700 upgrade so shall i wait or not? The D600 will be a full format camera with more Mega-pixels and a new processor?

Added (1). Well thank you all 3, i heard the rumors about D600 and D400 but as u all said i will probably buy D7000 cuz who know when will this one appear and many ppl say that they will stick to the D7000 and then wait the second camera after D600, the only thing is that i don't like D7000 for 16MP, i know that it isn't all in MP but it is nice to have them, you have ability to crop and have much more detail in landscape like D800 so it would be stupid if i just bought D7000 when the new one arrives even better for just a 400 dollars price difference and Nikon never says about its new cameras, why? Cuz older cameras are maybe not sold so to sell them all they don't talk about the new ones but i will probably but for d7000 and wait saome time after the new ones arrive so there price lowers.

What format does Nikon DSLRs shoot videos in?

As I know Canon does MOV and MVI files(correct me if I'm wrong)
but in what format does Nikon shoot videos?
I find Canon video files a bit of a problem to edit because i) i don't have a decent video editing software;I'm using Windows Live Movie Maker which sucks ii) I kinda like Nikon now.
I'm switching from 550D to a Nikon dslr to shoot videos.
What Nikon DSLR do you recommend[for video]?(Apart from the D7000, D700, D5000 and D800).

When will the Nikon D800 be in stock in UK?

When will the Nikon D800 be in stock in UK? It was meant to be released on the 22nd March, right? But now people are still wondering why it isn't out yet… I didn't pre-order it, thats why I want to know when it will actually be available IN STOCK!

Buying a Nikon D800 in Hong Kong?

Anyone knows where I can by the Nikon D800 in Honk Kong? I mean do you know where is actually available?