Agree with Itai about Any DSLR.
All of low-priced cameras a roughly the same.
I'd suggest buying something from Canon, because Nikon cameras of that price range may not have autobracketing feature, which is kinda crucial for outdoor photography.
And don't bother much about the lens. You can buy a kit 18-55 lens and be perfectly happy with it for at least 1-1,5 years while your are just starting to learn about photography.
Spot-metering is a great feature, but even if camera doesn't have one you can always set to central zone metering which also works great.
Never used DoF preview, not sure what it is - is it the button on camera which closes aperture for preview? That should be on all cameras I think.
Another thing I suggest to look at is a tripod. If you are going to shoot outdoor and landscapes you will definitely need one. Any cheap (~$50) will do for the first time, I used mine for about a year.
And again, don't bother on buying something great from the start. After a few months of using kit lens you might decide to buy a 50mm or 35mm(which will be better from cropped camera), but don't rush - kit is a great lens from the start.