For question number one...No you can't they are totally different cables.
For the blue ray with the hdmi i have one rocket something for my satellite that we paid like 100.00 for and then we got a blu ray for xmas and just bought a 30.00 one from best buy and i see no difference..
You can get resonable priced s video cables from Walmart. I have them on my daughters t.v and she still has pretty darn good picture.
Just my thoughts on it though
