The pickups that look like 2 single coils are more than likely humbuckers. They're sole purpose in life is to be quiet (hence...buck the hum).
The single coil, you should notice, is a bit noisier than the other pickups on your guitar.
Yes, you'll need 2 cables if your using a pedal:
Guitar -- cable -- pedal -- cable -- amp.
Now I've used the Metal Zone before and it can be a bit noisy too, but should be okay when it's turned off. Meaning, if it's on and you're not playing it may be noisy.
If you're not experienced with soldering
and cable terminations I would suggest not tampering with a Monster cable...would ruin its warranty. Just buy 2...buy the best and only cry once.
All in all you should be pretty quiet after the upgrades, but unfortunately noise is always present at some level...don't drive yourself mad about it.