I've been very happy with my Monoprice Zero-G. If you wait for one of their sales, you can get it for closer to $300. IPS abd 1440p is definitely worth it.
I was looking at that one as well.
In the time since I posted this, the guy on CL with the Asus came back with a $250 price and I am going with that. I like that I know the monitor is free of defects and is nearly new (guy purchased a pair of them for gaming and switched one of them for a 144hz panel for BF4).
Picking it up tonight. It uses a PLS screen that looks pretty nice from the reviews and I am really looking forward to the change. Goodbye TN, you are now relegated to forum duty