You won't find a good graphic design monitor with those specs. Specifically 2-5ms and 120hz denote a 3d gaming monitor.
In order to get those low response times and high refresh rates, those monitors use a TN panels, which only display 6 bits of color per channel and have awful color constancy.
Good graphics design monitors in that price range are IPS and include:
HP zr2440w, zr2475w and zr24w
Nothing from Samsung
If you don't know much about monitors, I'd recommend either the dell u2312hm or the u2412hm. They are good compromises between gaming and graphic work.
If you really want a 3d monitor (120hz, 2ms), I can't recommend any of them.