I have both whites and blues.
The whites can be adjusted to a closer to 20k look, but if you're running the the colors at equal percentages you will get the 14k look that you desire. That being said, I love the crisp look of the whites, but don't think that I will be mixing them on my new setup. With the controller, you can still ramp up and down to a blue look for your moonlight settings.
Just remember, blue or whites the controller will allow you to adjust to the spectrum that you prefer. The only downfall is that if you want a whiter 12-14k look with the blues, you'll have to keep the 2 blue leds dialed down (less light) and the same is true with the whites. If you desire a 20k look with the whites, you will be dialing down the white leds and therefore getting less light.
I personally prefer a 20k look, so I have choosen to go with all blues on my new setup, so I have 3 whites with about a year's use on them if you are interested in getting a good deal. :beer: