It's all down to personal preference really. If it were me I'd stick with silver because...
- White makes it look like a racing car.
- Gold makes it look like a rally car.
- Gunmetal grey may get lost against grey bodywork.
- Black reminds me of something out of RoboCop.
- Polished chrome, if lowered and windows blacked out.
But as I say, different strokes for different folks