All of the entry level SLR's are roughly equal. I'm a Canon junkie, so I favor them. There are some Nikon junkies here, as well as Minolta and Pentax. Any of them will help you learn more about photography, if you let them. Any of them will act like an expensive point and shoot camera if you let them. The choice is yours.
That said, if there is a camera shop close enough by to visit, go in, pick up all the SLR's in your price range, and see which one fits your hand the best. Are the controls easy to get to and see when you are gripping the camera? Go to popphoto.com and read their reviews of the different models you looked at, and see what others have to say about each one.
In the end, each brand has it's strong points, each has it's weaknesses.
You might also want to think about a manual SLR. You can pick up a pretty nice used Canon, Pentax, Nikon, Minolta, from
eBay for less than you'll pay for an entry-level new auto-everything model.
The learning curve is a bit steeper on manual camera's because you have to figure out focusing, changing aperture, etc. But it is a very rewarding experience the first time you pick up a batch of pics from the minilab, and your shots look great.
Hope something in this ramble helped!
