Out of the 3, the Sunfire is the best choice. However, I'd much rather buy a Chevy Cavalier than a Sunfire. Its supposed to be the same car, but reviews from previous owners on various sites seem to tell a different story.
You aren't gonna know what will provide the best insurance rates until...
You need to isolate the root of the problem. Obviously, its either the PS3, the TV, or the cables.
First thing I would do is the Video Reset, which requires putting the console in Standby and holding the power button on the console for about 5-6 seconds (wait for the second beep). This will...
Go to the Display Settings in the Settings category of the XMB, choose the RGB Full Range option and then choose Full. It sounds like you have it set on Limited, which can sometimes produce a "grainy/fuzzy" type of picture with GTA IV. Full should improve the picture dramatically.