Asus monitors are great, so I've heard. I've personally always spent the extra and bought Samsung, but really, it doesn't matter. And you won't notice a difference between 2ms and 5ms (IMHO), so a few other choices would be:
I personally would probably grab the Acer. No rebate to worry about, and a higher contrast ratio. I just bought a 19" Acer monitor for a customer, and he loves it!
Intel Core i7-2600K @ 3.4GHz || GIGABYTE GA-Z68X-UD3P-B3 || Corsair Vengeance 16GB DDR3-1600 || EVGA GeForce GTX 480 || Samsung EVO 256GB SSD
my feet get cold and that gives me diarrhea sometimes - Smart_Guy