Very happy with my modded VG248QE. Like others have said, total game changer. If you're comfortable doing builds, modding your own is fairly easy also. Just waiting on that 780ti price drop now to grab another to help max things out.
i5-3570k @4.6 | ASUS VG248QE - gsync mod | ASUS Sabertooth Z77 | Noctua nhd14 | EVGA GTX 780 ti | 8GB Ripjaws X | Corsair TX850W |Samsung 830 256GB | 2 - 1TB