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Well, I can answer a few of those questions..
1080p is superior to 1080i in that 1080 is the resolution and 1080P refreshes the whole screen in one sweep whereas 1080i refreshes every other line on the screen. This gives 1080p an almost perfect, flicker free image but it comes at a cost typically 2-4 times that of 1080i TV sets.
1080i is fine anyway and makes the PS3 games look great.
1080P is better and the best there is today but you wont really need it.
The Receiver is the big box that controls all the sound that goes out to your TV, Hifi, etc. Simply plug the PS3 into it and it will push the sound through the system speakers. The better the Reciever, the more power and quality it will push out.
Alternatively, just plus the PS3 straight into your TV via HDMI...
HD does seem to make the sound even better anyway....
In general, cables are important if you are spending money on a good TV.Hifi/Home Theater/PS3 system... I would recommend paying for the best cable you can buy. The connections should be Goldplated and the cable should be as resistant to interference as possible.
I have a $200 HDMI cable going from my PS3 to my HD TV and it is great.
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