I've tried a number of screen protectors, including the much-acclaimed Spigen SGP / Steinheil protectors. I keep coming back to Boxwave. Made in Japan, and very nice. It feels good to the touch--not grippy like others I've used. I've used their anti-glare and anti-fingerprint protectors for two of my digital cameras, and I use their glossy crystal one for my Samsung Galaxy Nexus. It's a dry application, but to be certain that dust won't get underneath it, go into your bathroom, shut the door, turn on the shower to HOT, and let the room get a little bit (not excessively) steamy. Dust particles will bind to the steam and not float around in the air. You can then apply your screen protector without too much fuss.
Right now it looks like Boxwave doesn't have any screen protectors for the Moto X. I assume they'll probably get some in the near future. I e-mailed them, once, about getting the best size for my 3DS and they were very helpful in helping me to find one with the dimensions I needed (since they didn't have a 3DS protector, they recommended me one that was the closest size).
By the way, I don't know how the Moto X's Gorilla Glass compares to my Galaxy Nexus, but my Gnex did start to get micro-abrasions, which is why I got a screen protector. I guess tiny particles in my jeans pocket were wearing on it. There were no scratches visible by just looking, but there were spots on the screen that were starting to wear, making the underlying screen slightly blurry. I'm very happy to have a screen protector. It almost doesn't affect the clarity of my screen, at all.