Good Chain Width?

Any of you guys wear chains?

I'm debating between 4.6mm and 6mm

http://www.sarraf.com/14k-Gold-4.6mm-Figaro-Chain-22"-In-1-781.html

and

http://www.sarraf.com/14k-Gold-6.0-Mm-Figaro-Chain-22"-In-1-767.html

not sure if 4.6mm is too thin or if 6mm is too thick, any opinions? I'm not trying to look like some tool walking around with a huge ass chain.

Thanks