Here's one thing you guys need to know about the 4k now. Hdmi 1.4 does NOT support all 4k content like high frame rates. Example sports game which many are filmed in 60 FPS, its not compatible with hdmi 1.4.
You'll have to wait for hdmi 2.0 for that feature of 4k.
final specs fro hdmi 2.0 will be mid 2013 and the first device compatible with it will come next year.
if you think your stuff is future proof, think again, its not. This thing will happen once 8k comes on a decade from now.