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Im looking to put together a new kit. Im considering stretching the budget a bit to grab a D800 and tamron 28-75 f2.8 possibly(other affordable choices welcome) and a prime for low light. or a D7000 with a tamron 17-50 2.8 vc and sigma 70-200 f2.8 os. which option is the best for me in your opinon? i want to be able to shoot photos of my daughter shes 3. video is very important to me.
I'd definitely suggest buying a separate video camera for family memories unless you already have a bunch of experience with DSLR video. As noted, it's nowhere near as easy on a DSLR as stills are. This is not a function of your skills, but of DSLR video being a relatively new technology. I've been shooting since 1982, and I'd love to do video on a DSLR... I'm just not yet finding it very easy to do: stills are much easier.
I'd suggest a D7000, Nikon 16-85 VR, and Nikon 70-200 VR to start off along with your other video camera. At some point now or later, you can add a Nikon 85/1.8G for portraits in lower light levels or with even shallower DOF than what the 70-200 can give you.
That'll be an extremely sharp and high-quality kit (and you can start learning your DSLR video without too much stress). I specifically recommend Nikon lenses because I've found their focusing to be much faster in low-light... the third-party lenses are fine, I have nothing against them, but they do lag behind the Nikon glass in low-light AF performance. Remember to budget for at least one or two good flashes... those'll make a huge difference to your final image quality if you learn to use them right. And with the Nikon cameras, you can use the built-in flash as a commander and use the other two off-camera to create an extremely flexible three-light kit with a relatively low cost.
I would definitely not recommend making sacrifices in glass to buy a D800.