I think when looking at entry level DSLR like these. The most important thing is feel. Go to a store and play with all of the above one that you like.
Now when you start getting in Nikon D80, Cannon 30D etc and up. The bodies and size really changes. Also you start adding on a lot of features, that more than likely you will never notice.
As far as the origiall ?? I am a cannon man, so I have a rebel. My only problem with is......or wait better to put it. Is it's only problem with me my lack of usable skills....LOL learning but still so far behind.
IMO......I would go with one two listed Cannon for me. Maybe used if you can. Then spend some good change on some nice glass. This is where you will see the biggest difference. A good walkaround/zoom lens and a nice macro to start out. HTH Tim