I am still using a pair of acrylic 23" cinema displays - 15 years old and working fine - but due to changes in MacOs I can no longer adjust brightness. I'm thinking this might be the time to buy a new monitor and am looking for advice on what to buy. I have a 2010 MP 5,1 upgraded to 2012 spec with an NVIDIA GeForce GTX 680 4 GB which should handle a 4K/UHD monitor @ 60Hz refresh ok. I tried a budget Dell but returned in as it made me feel seasick - when I scrolled a screen the colours seemed to lag the black and white. No point spending on a new monitor if this is likely to be a limitation of my graphics card though I have no such issues at all with the pair of Cinema Displays @ 1920X1200. If anyone can provide advice please let me know your suggestions. I like the area of dual screens so thought maybe to try one large 4K screen so I can have documents side by side as at present. I use FCP but don't do gaming.