I really like OPI's Light My Sapphire - I posted it above. It's a true navy. I haven't tried Russian Navy, but it looked a little sparkly to me, so I got Light My Sapphire instead.
It's not sparkly when it's on - its the perfect navy - really dark
I think I'm stuck in a color rut. It's either Essie Wicked or Chanel Vamp if I bring my own, for my toes. For fingers it's always Essie "It's Delicate" which is a good natural color for my nails.
I want to try Boris and Natasha!
I'm loving Boris and Natasha - seriously beautiful on. It's probably as dark as I can get away with at work without being too gothy.
I jumped on the Russian Navy bandwagon and love it. I'm wearing it on my nails right now. My next mani will be with Hollywood Blonde (glittery sheer gold)
My toes are OPI Have You Seen My Limo, which is a pretty, mildly sparkly violet on me.