I love the GY9 dark gold but for me, black is always king of the hill! If I had your Challenger I would not change it, but as 70Chall440 said, it's your car and ultimately you need to do what makes you the happiest.
I have a 2007 Harley Davidson Ultra Classic that I bought new that is all black. I also had a 2012 Ram 1500 that was black, but when we got a 5th wheel RV I had to trade it off for a bigger Ram diesel. I hated getting rid of that truck! For me black is beautiful, but the body has to be damn straight or it will show every imperfection. Black is also a ***** to keep clean!