For me it is just:
Price, Warranty, resolution, ports.
My primary monitor is an NEX 1880SX... It has a 33ms refresh time and a 350:1 contrast.
As far as I am concerned, nearly all panels are the same and I think that marketing is a load of BS.
Even in the day, it was advertised as "amazing 33ms refresh technology - stop motion blur" etc...
So - Get one that has the ports you need - if you want it to last I recommend you go for the cheapest price that has - HDCP enabled HDMI... resolution of at least 1920x1080 but if you can find one, 1920x1200 and has a warranty of at least 3 years (I find that if they go faulty, it is 80% of the time in 18-24 months, otherwise they go for several years longer)