I the problems your slim has with the receiver are static and occasional drops, I would try bypassing the receiver and going straight to your TV with a short HDMI cable before I went out and bought a new PS3. If that fixes the problem, you might be able to get away with just using and HDMI extender/repeater rather than a whole new PS3 slim.
FWIW... I've had a slim, a 60gb, and a 40gb MGS model, and the slim was, by far, the most sensitive to long HDMI runs and other sources of interference.