Getting $500 over invoice would normally be easy but my guy is telling me that if the individual leather gets approved he won't have much price flexibility. I would almost be willing to go to $1000 over as a courtesy for the service but that's probably about it.
BTW, Platinum / Piano is my favorite, but don't let these guys mess with you. The maple would look seriously classy. These guys like edgy interiors like fox red etc... I like classy interiors. Platinum / Wood is a 7 series staple. Too me the M3 should be all class on the inside and all beast when you hit the gas.
Let me know how your deal goes. If mine goes south, I hope you don't mind if I contact your guy.