This is a site which I found very useful when I was looking for a cheap digital camera a couple of years ago. Apart from the reviews, it gives sample images ... for me, the brands which stood out on picture quality were Canon and Nikon. So I bought a used Nikon Coolpix 2200 on ebay for about 60 quid, and I�ve been very happy with it. You�d get something better for the same sort of money now, of course.
However, they don�t give a review for the Samsung d75.
http://www.imaging-resource.com/