Originally Posted by jphughan
Sorry if this makes your decision even more complicated OP, but given the two you've listed have you added Carbon Black to the mix? It's an M-exclusive color that for some reason isn't offered on the M3. I know you'd share a color with several other models out there if you went that route, but the black with blue undertones can't be beat IMHO and it seems like that's what appeals to you based on the colors you're considering.
Good luck and congrats!
Saw a 650i with M package (or something stupid like that) with the Carbon Black and thought it was a dark blue paint. Absolutely gorgous and I would have loved to see it in multiple lighting situations to see how it changed.