The Nexus 5 is considered by many (including us) to be one of the best smartphones on the market. It should remain a top option for much of 2014 thanks to Google's Nexus release cycle.
Google, like Apple, releases one flagship smartphone per year. That device is called the Nexus and it usually emerges at the end of the year. The Nexus 5, for instance, arrived in November. Rumors point to a brand new Nexus arriving late in 2014, something that fits in with Google's pattern.
Nexus 6 rumors are scarce though they do suggest that it will once again be made by LG. LG or not, the Nexus 6 has the potential to be a top smartphone. Nexus devices always come with top-notch hardware, vanilla software, and cheap price tags. There is no reason to think that the Nexus 6 won't do the same and that's why it's on this list.