In my experience, using different shades of your similar base colors makes for a better looking color combo. Instead of using only two colors.
Try this site out to find new colors: http://www.dragonsworn.net/dyes/
The only suggestion I can make is maybe try to find moderately-sized shoulders that go with the set to minimize the unfortunate top-heaviness of Charr helms. Maybe the Noble shoulders would work with your pink/black scheme.
The Peacemaker that Pip mentioned is.. pretty close too. What might work better instead of trying to match that pink is to go for more neutral colored weapons. black/grey/silver/white...
OR... you could do one of the super rifles. It adds more "outrageousness" to this set. To be fair though... if you weren't hung up on rifles, you could totally roll with Quip or the mesmery guns Ilya and Lyss.