Very nice looking kit.
I ran a 2" on my 05 and was never happy with the amount of air in the airbags when towing. I dropped to a 1" and WOW, it took 1/2 the air and the truck was far more stable. The 2" also had a nasty effect on the ride, but the control arms of the 13+ trucks are much longer so I doubt the same thing would apply.
I don't think spacers are bad in the 2" and under range, especially since coils are hard to find in the 1" range.
In the end it all depends on how you use your truck, and what suspension it has. The 2" looks the best, but is a pain if you load up often. The 1" is nice compromise of stock look and loaded performance... that's all with the standard suspension.
With the auto-level you can lift the front about 1" but then you won't want to use the alt ride height which is going to effect loaded handling, unless you don't care about sitting an 1" low in the rear when loaded. Or you can lift both the front and rear.