I am intrigued by the LK530 mystery. Where did you find this tv? It seems like a nice set. You noted that it has ARC, and previous posts have indicated it has SmartTV, which will be very nice if LG delivers on it's promises this fall. How do you like the SmartTV?
If I look for it on amazon, I get hits, but the product description states 520 everywhere, and the described features are clearly for the 520.
I'd keep it too if I had one.