What is the distinction of these specialist digital cameras?

by ibarra_svd
Query by gerbs_luvs_yumi: What is the variation of these professional digital cameras?
Canon Rebel Xti
Nikon D40X
Nikon D50
Nikon D70

I am pondering about buying one of them at ebay, and I would like to get some assistance since these can be nearly the exact same price tag.

I will be taking some digital photography class at school subsequent semester, and I am a novice for professional digital cameras.

I would like to find out a lot more about cameras in the long term, so I

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