The D90 is a fine camera and very user friendly.I dont mean to sound negative. But this is insane. So basicly if im holding the camera in my hand it's probably not going to focus well. I have to have it stationary on a tripod. Thats nuts. So when im walking around on vacation, or at a party, or taking pics of my kids playing I need to put it on a tripod. That's not realistic. What would be a great camera that doesnt cost a fortune that takes great pics without having to use a tripod. D90/t2i?
The D7000 is also a fine machine and can certainly be used hand held, but... the new machine wants an operator who is paying attention to being a photographer. Simple P&S tactics are never going to yield consistent results with the 16 MP D7K or any other equivalent machine for that matter.
It doesn't take a rocket scientist to develop the basic skills necessary to making consistently sharp well exposed images. It does take a bit of effort up front on the part of the user.
Learn the basics of exposure. Good exposure makes good contrast, good contrast raises perceived sharpness.
Support the camera/lens well and practice this tactic. The weight is supported by the left hand, the right is a light touch and free to make adjustments and caress the shutter release. Firm contact between head and eyepiece rubber/cup. Steady respiration, elbows tucked in but not forced. One foot forward of the other, upper body weight settles comfortably to the rearward hip.
And that shutter.... oh those bloody shutters
While you're sitting around the house doing nothing important, take up the camera and practice. Get to know the feel of the release stages. Practice with your eyes closed to bring that muscle memory into your inner brain. A nice shutter release needs to become second nature.
I'm a 35 year Nikon veteran who has owned most of the cool pro bodies. The D7000 kicked my butt for the first while because I had become sloppy in my shooting technique. I had to re-focus (intended) on the basics. I had to learn the different and lighter feeling shutter. Didn't take all that long and I'm now running around with the D7K and 300mm lenses making nice pictures hand held.
I'm an old fart and much less steady than in years past - if I can do it you sure as hell can
--
Holmes