Since you dont play online fps then there is no use of the increased refresh rate since you will be playing games as RPGs (skyrim, TW) or even third person view shooters or games (ME, batman, gta). On these games, more than 60 fps is useless but higher res gives higher quality image with higher details. Higher refresh rates are really needed for online FPS (which you dont play) to increase smoothness of the game. Since your gpu can handle 1440p, then i would recommend it.
Thanks, much appreciated.