My advice is to stay away from the cheap cameras. eg, Nikon Super Zoom and other low-end super 8 cameras. You might get a nice image with them for a while, but they have tendency to break down. (at least mine did) When compared to 16mm cameras, higher end S8 cameras are still really cheap...
It also depends on what you want to do with the camera. If your a lomographer out to capture fuzzy stuff then use whatever you can get, but if you want the best image possible, you are going to be using negative stocks and spending close to what you would spend for 16mm, after you transfer, color correct etc etc...
Have fun -- hope this helps