Samsung Galaxy S4
The Samsung Galaxy S4 is Samsung's flagship smartphone for the moment. It will soon be replaced by a Samsung Galaxy S5. But like the HTC One, it will remain one of Verizon's best up until it's replaced by the Galaxy S5, something that should happen in April.
Even then, the Galaxy S4 will remain a solid choice. It will be getting Android 4.4 KitKat soon, it should get some of the Galaxy S5's features and it has a price that is much easier to digest. Needless to say, it's a smartphone that's worth your attention.
The device should get whatever is after Android 4.4 KitKat as well, meaning, this is a device that isn't going to die off as soon as you buy it. It will, however, be punted down the totem pole in the near future.