Resolution Is The Key To Picture Quality

The Venture has to be around the resolution of most digital keychains - its bad

The Audivox is a little better at 480x234

The Insignia is the best of this group with 640x480.

From my experience don't get a digital photo frame with less than 640x480 because low light or complex shots may appear blurry or pixelated.

I would also check the contrast of any digital photo frame you buy because that matters also.