You can get the full on Pure Vanilla Android Kit Kat 4.4 experience on your Verizon Galaxy S4 now thanks to the development of team Gummy Rom! Gummy rom is made for speed and stability and sticks as close to AOSP as possible while providing the user with a few extra goodies and customization options. This Rom stays slim and doesn't overdo it with the customizations like some other roms. It should be noted that you should not use PA gapps. You should exclusively use the Gapps provided at the Gummy link below. Some features of this rom include status bar mods, hardware key mods, many wallpapers, performance control, application permission control, carrier label options, lock clock widget and more.
The latest build of Gummy for the Verizon Galaxy S4 does include lots of bug fixes and performance enhancements. You will not be able to install this if you are not LOKI hacked. This will not work with SafeStrap since it is AOSP. You can head to the link below for the downloads.