So I want an IPS fast refresh display with 2560x1440, 27", G-sync or G-sync compatible, ~$500. I have owned ASUS and DELL in the past and am happy with both.
Using for BFV and general PC stuff like MS Office, surfing pr0n, etc...

Looking at the following:

  1. ASUS Tuf Gaming VG27AQL1A
  2. ASUS ROG Strix XG27AQ
  3. Dell S2721DGF

All are good, I think. The Dell has good color accuracy. ASUS models have complaints about displayport going into deep sleep mode.