If you can get that for 900$ I spose so.. You may want to sell the GPU though and go for a 780 or something. Keep in mind: most of the parts in that PC are older.
Here: http://pcpartpicker.com/user/dyslecix/saved/BHJtt6
r7 270x better option over 760.. if you get that korean 2560x1440 you will need the amd gpu since its runs better at higher res than the gtx 760!