What is the difference of these professional digital cameras?

What is the difference of these professional digital cameras?
None of those are professional level cameras, they are amateur and advanced amatuer units only.

See http://www.dpreview.com for a good start in learning about digital cameras.Even though those cameras are far superior to point-and-shoots, they are not at a professional level.

The D70 was replaced by the D50 and the D50 has been replaced by the D40 and D40X.

Don't buy an old SLR - it's not worth it. The newer ones are always better and cheaper.

The D40 will do everything you need. You don't need the X.

Have fun!
Canon Rebel Xti
Nikon D40X
Nikon D50
Nikon D70

I am thinking about buying one of them at ebay, and I would like to get some advice because these can be almost the same price.

I will be taking some digital photography class at college next semester, and I am a beginner for professional digital cameras.

I would like to learn more about cameras in the future, so I am thinking to get one which I can use for long time.

Is there any suggestion???

Thanks.

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