OK, I guess I have the time to answer your questions.
First recommendation: before spending so much money in a camera get to know what a dSLR is, and how they work. Just reading a little theory will help you, because maybe you don't really want a dSLR and you may only want to have a nice P&S camera.
For example, ISO is the sensitivity, the higher it is the more light the sensor would "capture", but you'll also notice an increase in "noise". You may also want to read about the meaning of aperture, shutter speed, focal length, depth of field, etc. This is a
link you may want to visit.
Megapixels does not mean you have a better camera, you might have a 12MP camera, but if the sensor size is small they won't help you much. Basically one of the advantages of dSLR are the image sensors, which are MUCH bigger than the normal P&S sensors.
Also, you may not need more than 6MP. You have to take into account if you would ever print large photos.
As for lenses, there are three mains types you may want to know at first: the wide-angle lens, the "normal" lens, and the telephoto lens. The wide-angle, as its name says, let's you have a wide shot, it is around the 18mm focal lenght, meaning this are generally good for landscapes, but you want to be careful when shooting persons, since this lens may deform the faces (if you are very close).
The normal lens is just that, it is around the 50mm of focal length and is good for many things. Many lenses cover the wide and normal, specially the kit lenses.
Then there are the telephoto, which have a large focal length (around 200mm), you may want this to shot subjects who are far from you, like in sports.
So, which is the best camera for $1000? There is really no answer here. What you buy is more a brand, because you would usually stay with that brand the rest of your life. The body you'll change it in a couple of years, but the lenses would be there forever.
I personally prefer Nikon. I currently have a Nikon D40x and it is an amazing camera. But I also bought a nikon because my dad already had some Nikon lenses.
And I guess I have already wrote too much, so I'll just give you one last comment. A good photo is not the product of a great camera, it is the product of a great photographer.