I just ordered mine this week too. I got Z-2, Z-5, Z-6, and ZFX. I will use the Mothers clay bar I already have. I have had water spots since day one on my hood. I will be either wet sanding it, or buffing it with compound tomorrow, or both, to get it perfect before I Zaino it.
I went with the ZFX instead of Z-1 since I knew I would have the paint near perfect before I start the Z-5. Not to mention with the humidity already terrible, it will help to cure the Zaino quicker.