The monitor will most likely last much longer, and be a more worthwhile upgrade. Nvidia Pascal is coming soonish (2016?), so maybe consider that? Yeah the 970 won't max out on high res games with a 144hz monitor, but it doesn't mean it won't look better. You will probably have to turn down settings more though.
I'd say do a 144hz 1440p Gsync, and then either save for a new GPU or SLI.
PS: All of those links are broken.