different wheel patterns and sizes for that matter will all look different in the same colour, wheels that have a larger surface area don't look as good in the darker colours and in the smaller diameter size, whereas thinner spoke patterns or very open pattern rims can get away with darker colours as there is less surface area showing the actual colour, yet another optical illusion that wheels and colours play on the eye...
have you considered Graphite color, darker than silver etc but not as dark as gunmetal and those shades...just my input.