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Wiring, fuse, amp, relay questions

I'm trying to figure out the correct fuses for powering a 400 watt inverter, (800 peak), and a 150 watt PSU. 950 watts divided by 12 volts would be 79 amps, right?

I was told on the main power lines using 4 gauge wire, I can put 125 amp fuse, right?

In the pic below fuses 1 and 2 I have a 125 amp fuse, right?

Fuse 3 is before the 400 watt inverter, which is pulling 66 amps, so an 80 amp fuse, right?

Fuse 4 is before the 150 watt PSU, is pulling 12.5 amps, so a 15 amp fuse, right?

Fuse 5 is before the computer, pulling 150 watts I guess, so a 15 amp fuse, right?

Fuse 6 is before the playstation2, it pulls 76 watts, so an 80 amp fuse right?

http://www.mp3car.com/vbulletin/atta...id=14436&stc=1

Next question is about wiring the relay. Would this be the correct way?

http://www.mp3car.com/vbulletin/atta...id=14437&stc=1

Two more questions, the switch I want is for 12 volts, and says 20 amps. Is that ok with a 200 amp relay? What size wire would I run from switch to relay?