IPS monitors typically have decent stands. The Dell ultrasharp series for example are quite good in my opinion.

I don't think I've seen a cinema display with a monitor-arm, I'm a bit skeptic that people that buy the cinema display could ruin the aesthetics of the display with an arm (not that the cinema display is that good looking anyway).

I don't feel that an arm is needed when a good stand is included, and a good arm can easily cost as much as the monitor in the first place. Better to buy two monitors with good stands than one monitor with a crappy stand and an arm - in my opinion.