What do you do with your computer? Do you game? Video/audio editing?
If you game, what monitor do you have? What's its resolution/refresh rate?
Sorry to bombard you with questions - but all of these will affect what we suggest for you
Monitor will be acer h236hl and I game, dont really do any editing.
right now i have GTX 780 SC and FX 6300 which is not very good. budget is open (no 400-500$ cpu's tho)