your budget is too low to be able to do this.
you can do 1440p, but you can't do 144hz with that card
for now, i would leave the gfx card as is and upgrade to a 6600k, hyper 212 evo a z170 board of your choice, 2400mhz cas 15 2x8gb ram
example:
http://pcpartpicker.com/p/27wQt6alternatively you could do the 4670k and keep your current ram (upgrade later to 2x8gb 1600mhz+)
and get a case that you want instead of the one listed above.
example:
http://pcpartpicker.com/p/7NqJqsreally up to you

the performance gain between the i5 and i7 in both instances in neglible, your video card is MUCH MUCH more important and at a difference of $100 you would be better off adding an ssd or saving it until you can upgrade your current gfx card
down the road, if you're looking to upgrade get 2x 980 or 2x 980ti or whatever x80, x80ti, titan pascal will have to offer (depending on perf gain/$ ofc)
This post was edited by Penguins0690 on Feb 4 2016 10:51am