24" with 3840x2160 should work perfect in HiDPI mode. Although I'm waiting for an OS X Mavericks Update to support 4k at 60Hz via Thunderbolt 2 (i.e. Display P

24" with 3840x2160 should work perfect in HiDPI mode. Although I'm waiting for an OS X Mavericks Update to support 4k at 60Hz via Thunderbolt 2 (i.e. Display Port 1.2).