Welcome to the forum.
I don't have photoshop, but I did a rough job of it using Microsoft Paint. The red Empulse is nearly all black, and the red is a good contrast colour in my opinion. The test in gun-metal grey made it look nearly all black and it lost some of its look, but it might have been because it is a two dimesional picture. Have you seen the Enertia in grey? I think the grey and black Enertias look nice.