I was also debating the same thing. I think it's time to retire the NH-D14 in lieu of something that can offer me better temps and my choices came down between these two kits.
Now whether or not I'll actually end up getting one is anyone's guess, I'm still afraid of water in my system. :/
But my personal opinion was spend the extra $100 for the EK kit and you get marginally better components with a name that has a stranglehold on top shelf water cooling. Next to building a kit yourself with all custom parts the EK kit is probably the best you can do.