Save your money and get the DBK, absolutely no question.
Seriously.
I can send you the mono version DMK21 if you want to borrow it for a couple of weeks to have a go. The other cameras in your list will be nothing but disappointing, and the DBK was $499 not long ago, it has only dropped in price because a new model has come out, it is astounding value.
This is an image taken with a C8 and the DBK21 camera.
http://www.flickr.com/photos/jasmel90/6275849504/
Drop me a PM or an email with your address and I can send you the DMK to have a play with.