Spend the extra dough and get the one you want. Everyday you turn it on and watch, you'll be cursing at your wife and wishing you got the ST50.
And why is it open box? Somebody may have gotten it home and there were dead pixels, too much buzzing, etc. Just check to make sure you can take it back if something is wrong with it.
Klipsch RF-52 II // RC-52 II // RS-42 II
Klipsch KG 2.5