Just found a new PC 7424 for $130 so I bought it. I also bought a couple of smaller back plates. In addition, I bought a couple of pads, a Sonus SFX-2 Spot Pad and a Sonus SFX-3 pad. Tell me what else I should have in my arsenal. I'm new to maching polishing and since I have a couple of huge SUV's coming up soon, I need to know what all I will need. Thanks, guys.