A large variety of cameras and lenses would likely work. The aforementioned Sigma 10-20 is great but tends to be so wide as to not be too useful outside of landscapes/cityscapes, etc. It does generate some BEAUTIFUL star effects on lights at night with the smaller aperature. Really awesome results for night photography with this lens in general.
A good starter lens for you might be the 18-135. It's reasonably wide for decent landscapes and such but also gives you a lot of general flexibility and doesn't so horribly gimp you when you need more zoom. Lots of cameras these days also come with kid lenses of 18-55/50-200... these are fine, too. Basically don't go any less wide than an 18mm and you should be ok on landscapes, but having the 10mm is REALLY enabling.
On camera bodies (at least in the Nikon space) if your budget is $1000, go with the D80 or better. I think the D200 body is right around $1000 new now, so I would recommend that. Don't go any less than the D80.
Keep in mind, I am MASSIVELY oversimplifying here based upon a very limited amount of knowledge about what you are looking for. Thefore, don't take anything I say as gospel.
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