There are many very pleasing standmount speakers at or under that budget. Beyond the fact that the speakers mentioned sound quite different, one needs to consider the power requirements of the speaker and the room size. I am thinking the Elac may require the most and Klipsch the least power. I know I would prefer the sound of the Elac. The Klipsch tend to be more harsh leading to fatigue. The Elac and the PSB lean towards the warm side. PSB and NAD are known to mate well.
Sorry, I am rambling.