Get the 600M, I have one and It was worth the $3K

Also I bought the Panny 50"G10 and had buyers remorse because I didn't spend a couple hundred more for the 500M. I was kicking myself in the ass for 2 weeks until I finally said F it and returned the Panny and bought the 500M. Nothing against the Panny(I have one in the basement), but I wouldn't of been able to live with myself if I didn't get one before they're all gone. Get the Kuro