Not many, and for the love of god DO NOT start at 180.
It's either pearl black or black gold I believe. I bet if you PM Struggler he'll remember.
Are the wheels badly damaged/kerbed?
If not, start at 800.
Any bits that are messed up, work down from 800, so try 600, try 400, try 200... until you find one that takes the mark out. Don't just jump straight in with a coarse grade or you'll have to work back up...