right, with regards to the FPS, you can select unlimited which goes as high as the cpu+gpu allows, if you can reach the 144 fps mark, then your monitor if its 144 hz can generate it, your currently playing on a 60 fps locked setting which you can change.
also, the ms when it comes to mmos doesnt matter a single bit, at all, the only time this point matters is if you play First person shooters at a extremely high lvl, by this you actually earn money doing so.
the 660ti will struggle at 2560x1440, thats a ton of pixels, even a 780 ti can be brought to its knees at such resolutions, the best monitors for mmos are ultrawide screens, 21:9 screens, they are 2560x1080 resolution but gives a insane screen real estate, which actually benefits mmo games more then anything else, though you still need a bit of graphics grunt with more vram