Depends on what kinds of pictures you want to take and how you're gonna use it. Many of the consumer grade models have lots of advanced features and will give you a lot of bang for the buck. The professional models give you the advanced features, faster speeds (shutter lag, film advance etc.) and extreme ruggedness.
But the camera body is really only a medium sized percentage of what you'll be spending over time-- it's the lenses that matter the most. That's where the smart money is spent.
Try to go to a camera store and play with all the different [brand] bodies in your price range. You'll probably find that one brand is easier to use and feels better in your hands.