Hard to say. AMVA is a new tech based on VA panels, and while VA definitely had drawbacks, the contrast ratio was definitely better than IPS. The main drawbacks were viewing angles and lack of 8/10 bit color support. Apparently, this is changing with the AMVA 4k panels although I could be wrong. It's what i've heard, but we won't know for sure until Q1 2014.
Plasma definitely has drawbacks preventing it's use on traditional monitors. Namely, the power consumption is even higher than that of CRTs of the past. That said, i'm still a huge fan of plasma for HDTVs. LED can't really come close to plasma in terms of contrast ratios and responsiveness.
Unfortunately, plasma was recently discontinued, though.