Today I'm wearing...
OPI...Eurso Euro, a bright royal blue / navy from OPI's 2013 Spring Collection: Euro Centrale. It was very bright and eye-catching on my nails. It was opaque in two coats and had a great formula.
With cobalt and navy blue being such hot nail polish colors right now, I figured I must have another royal blue like it, so I dug through my stash. To my surprise, it was not a dupe with any of them. China Glaze's First Mate was much more toned down and dusty; OPI's Dating A Royal was less navy and had a jelly consistency; OPI's Road House Blues was much darker.
I think I'll keep First Mate and Dating a Royal and donate Eurso Euro as EE was just a bit bright for my taste against my pale skin.
A note on finding OPI: It's now available on Ulta.com! Happy shopping!
Disclosure: I received this polish from the company for an unbiased review