Best digital slr camera?

I'm buying a used dslr camera. I have a few options and I'm just not sure which one to choose
Sony A330
Nikon D40
Canon XTI
Canon XT
Canon Digital Rebel
Sony A300

Just let me know which one you think is best and why

Thanks a lot

Added (1). I just want to know your favorite camera overall…

The Nikon D40 is perhaps one of the best entry level cameras of its time.

If you want to know why, you really need to do your own research.

It all depends what you want to do with your camera. If you want to use strobes or two flashes( one master and one slave) you will have to spend more money. All the cameras above are good. I have a Nikon D60 that still captures great images.

None of those are the best (there's no such thing really), but they are all very capable. You can't really go wrong with either of those.