Honestly, I don't like any of them... your original is better. From a branding perspective, if you are established I would seriously think about the logo change. Are you changing it as part of a strategic move to enhance your brand or image? Or is the change because you are tired of your current logo? If it is the latter, take a step back and consider alternatives such as subtle "enhancements" of the current logo. Perhaps a slight font change or a splash of color.... but a complete redesign might be a risky choice.