In my view, Goldcoin has the best chance for success with mainstream consumers.
Most digital currencies are very much like gold. There is a limited supply and in order to obtain it, it must be mined or purchased. And just like in the real world, anyone can mine it as long as they have the proper equipment. To mine physical gold you use pick axes, to mine digital gold you use special computers. In addition, the more gold that is mined the harder it becomes to mine. In other words the same effort with the same tools produce less and less coin output. This is identical to how a mining operation functions in the real world. So the name Gold fits perfectly.
I've had a lot of time to test market this name with community members, family, and friends. Try this: Explain to someone you know that is oblivious to digital currencies that you would like to give them a few coins and they can choose from one of three. Pick any two coins to match up again Goldcoin and you find that 100% of the time, the person will choose Goldcoin. So now we have a name that not only fits, but the name that people (aka consumers) prefer to have and hold.
I'm not suggesting that people invest in this coin strictly because it has a great name that fits or because consumers prefer it over every other single coin, I'm simply suggesting that once we complete our work at building a solid foundation, we will be well positioned to compete in the digital currency market at the highest of levels.
Come check out the forum to learn more, and grab a 100 free Goldcoins while you're there: https://www.gldtalk.org