StealthCoin of course with its 3D wallet and anonymous StealthText:

I wasn't going to trust it long term as i feared it might just be a clonecoin with added gimmicks but now I see it has a 3D wallet I'm sold!
Damn.. I thought that technology was reserved for hollywood film studios, I'm impressed the development team has managed to bring it to our desktops. I think that's a sure sign of it's longevity