Saw this and got me thinking, and I reckon for us black is better for a front mount and silver/unpainted is better for a top mount, given all the information at hand.

I will be going a Process West top mount at some stage in my build, was considering anodising it black to negate any insulating affect of painting but probably not worth it.

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"ALLPAWS" 2014 WRX RS 40 - modding very slowly.
2002 Mitsubishi Airtrek Turbo R - Ralliart Edition (daily)
2010 Nissan GT-R - when the Missus let's me drive it :)
Crotch Rockets . . .