Why, how good are you at using them? If money was no object, you wouldn't be here asking us, you'd have your butler down the store picking one up for you.
Frankly, I was surprised when I saw the D5000 does video. It won't be as fully featured as a dedicated video camera. So again, if money was no object you'd buy a still camera and a separate video camera - no problem, your butler will carry them for you.
Familiarity with your equipment, skill at positioning yourself, knowledge of the various factors affecting the light that makes your images - all these result in good shots.
In theory, spending the maximum you can afford on a camera will get you the best, but then you might not have any left over for extra lenses - a super-range zoom won't perform as well as those with a smaller range. Fixed focal lengths will out-perform even those.
And then there's those Speedlite flashes to spend any remain pennies on.
Care to phrase a new question?