Damn thats cheezy about the Wii. Not even 720p...and they make you buy the cable to get 480p. Do they use a proprietary* plug like the x360?
I think the PS3 uses a standard HDMI plug, so you could buy these cheap, yet well regarded HDMI cables.
http://www.monoprice.com/products/subdepartment.asp?c_id=102&cp_id=10240&style=