Yes, a 4K TV, which has exactly the same number of pixels as you have now.
Check the Cubase and 4K monitors? thread.
Note that to have the same size pixel as your 27", a 4K would have to be 2 x 27" = 54", with 55" being the typical size available. However, a 48" might be a better overall size.
The only issue is that your current video cards cannot drive one, as they mostly need HDMI 1.4 or 2.0.
Many 4K TVs accept HDMI 2.0, which allow up to 3840x2160@60Hz, but except for the top end nVidias, no video cards go above HDMI 1.4, at up to 3840x2160@30Hz, which is fine for most computer use except serious gaming.
I bought a Gigabyte GV-N750OC-2GI as an interim, until HDMI 2.0 cards come out with the same low power and quiet fan. It is currently driving my 4K and three Dell S2340T FHD touchscreens.