A monitor does not bottle neck a card at all. You will get the same FPS at 1080p on a good monitor and on a crap monitor.
Now the crispness of the image will vary by monitor and you will notice more lag with 5ms or higher monitors.
Now I would not buy a lower end card due to a monitor, I would get the higher card and get a better monitor latter.
Now with all of that said you need to put money into the rest of your build.
You cant overclock with that B85 board (at least not well).
With your rig the overclocking will make very little difference in performance, only in cost to do it right.
Get an i5-4460 and a Gigabyte Gaming 3 board
http://pcpartpicker.com/part/gigabyte-motherboard-gab85mgaming3
Pay the money for a better SSD drive. That drive is not cheap because it is close to a Samsung evo, it is because it flat out sucks and they are trying to clear stock (just like a Kingston v300). If you cant afford the Samsung Evo then get Crucial or Sandisk.
Also that Green Hard drive is fine for music/movies or backups but it will be noticeably slower for gameplay (or programs/OS) as all the maps and everything being accessed from the drive will be a good 20-40MBPS slower then a 7200rpm drive.