I can't speak to the overclocking potential but I installed one in a silent build last week and with a 2600k running at stock and the fan on minimum temps were good (much better than the stock cooler would have been). I wouldn't recommend using a $35 heatsink on an overclocked 6-core cpu though.
Later this year there's an Asus 4K IPS 144hz Gsync 27" monitor coming: http://www.kitguru.net/peripherals/...-is-the-worlds-first-144hz-4k-gaming-monitor/
but that will probably be towards the end of the year if I had to guess. Both the Asus ROG and Acer Predator are well-liked monitors, but I've heard of the Acer predators having a "more-than-necessary" anti-glare coating on the screen that can be noticeable when reading text on a white background. I haven't seen one in person to validate, but if I were going to buy a monitor today I'd get the Asus between the two. My only concern is quality control and the possibility of more backlight bleed then I'm willing to tolerate (I returned two monitors last year due to this), but it would be a risk with any brand.
And it will cost 2000$ dont forget that.