Here is the best price found on a new PC:
Porter-Cable "PC"
Your best bet is to obtain a PC and a 6" backing plate from:
Backing Plate
Foam pads:
Advanced Foam Pads
Guide on type of foam pads and what they are used for:
Foam pad guide
Porter-Cable info and guides:
PC Guide AND:
PC for beginners
Don't waste your money on inferior polishers! Get the one used by all and enjoy the way it works in getting your finish perfect without risk of burning it!
As for polish, the GEPC is great if you have minor swirls. Or you could go with Megs #9 SMR, or 3M SMR followed by a glaze such as Megs #3.
Since you are going to use Zaino, get the finish as perfect as possible as Zaino does not hide very much, even with the new Z5. It does hide VERY minimal spider webbing type scratches, but that's it. Just make sure you find a way to remove all oils left behind by polishes via Dawn and Z7 wash or Alcohol/water spray.
Your application looks good, Z6 prior, then ZFX/Z5 and Z6 again between coats. Once your happy with how well it looks, you can switch to Z2 if clearcoated as Z2 is optically pure.
Some people top Zaino with wax after they are happy with Zaino to give a little more depth, with the caveat that you'd have to remove the wax B4 any further Zaino applications. But at least the wax can become a "sacrificial" protection level before it starts to effect the Zaino layers.
Order the PC, get the correct polishes and Zaino away!
Regards,
Deanski