If your not adverse to buying Samsung, they offer a reasonably priced - and good looking - 28" 4K Monitor for around the £480 (UK) mark.
http://www.samsung.com/levant/consumer/computers-peripherals/monitors/led-monitor/LU28D590DS/ZN
Opinions?
http://www.samsung.com/levant/consumer/computers-peripherals/monitors/led-monitor/LU28D590DS/ZN
Opinions?