Argh how frustrating, there is no Apple 4K display out yet so here are the options if you have $3,500 in your pocket 🙂 And I personally can’t wait for the day that these panels come down in price.
There are other options out there like Asus’s 32-inch PQ321Q or previously mentioned 32-inch Sharp PN-K321, both of which you can connect to a Mac Pro via DisplayPort or HDMI. Hey Apple, Where’s Your 4K Thunderbolt Display? | Gadget Lab | Wired.com
