It's not really a fair test to upload on here as they are all down sized. I think it would be fair to say that the quality is closely related to the number of pixels. Go for the biggest you can afford. I have a Digital too (Minolta D7D SLR) but the quality is not apparent until you look at larger images, in fact sometimes when the image is shrunk to fit it looks worse.
Go for the 1 you feel most comfortable using, that way you will take better shots.

HTH