Doesn't seem to be any reason to wait. CES, as far as I could tell, was a massive disappointment.
One thing you need to understand about the Asus HE is that's the refresh. It does 144hz 2D (still limited to 120hz for 3D I believe). While the refresh is superior, it no longer includes the 3D Vision 2 kit built in. That's a separate purchase. The 278H has it built in. The 278H had some user complains about "figure 8" lighting issues. A google search will enlighten you. Despite that, assuming you got a good panel, it's considered the best 3D display out there. The 278H is even better, but again, that'll require additional money for the 3D kit.