Thanks for the responses, GT, Sooner, Flick and Cel. Yes, I do have a discount for these particular floorspeakers where I work, which is why I can only choose between these three. I did indeed go to a store and listened to the Energy CF-70's and was pretty impressed with them, but I don't know anyone or anywhere that I can listen to the Polk RTi A9's at.
The Klipsch KF-28's I am not really that impressed with, especially the build quality - they look and feel a little on the cheap side (no offense to anyone that owns them!) versus the Energy CF-70's which are built like bricks and look sexy as hell.
Right now, the choice is between the Energy CF-70 and the Polk RTi-A9. I'm planning to get four of these floorspeakers for a 5.1 surround sound setup... I'm leaning toward the Energy, only because I've heard them. However, I've haven't yet listened to, much less seen the RTi A9's yet so it isn't out of the picture yet.