finally caved and bought the PN60F8500 from Bestbuy (in Toronto, Canada) because it was only sale @ $2000 and no tax! Great deal here, by far the best price i've found.
Anyways, hooked it up and it's amazing picture quality, black levels, colour reproduction - everything everyone's commented on the picture has been really accurate.
that said, i definitely also have the audible buzzing from the rear and front of the panel. I sit about 8-10 feet away from the TV and you can definitely hear it directly in front. If you sit at the sides the buzzing literally disappears, very weird. Other members commented before that the buzzing is louder with certain colours which i've also noticed. It's not a deal breaker for me, but i can definitely hear it on quiet scenes or on the PS4 menu screen.
I've updated to the latest firmware and currently running through some slides. I've read through every page about the buzzing and i think i've concluded that there's no real solution to it...while some people either got lucky or just cant hear it.
Aside from the buzzing, the panel itself is superb.
BTW - does anyone know how to fit a sound bar if i'm also using the stand it came with? haha, the stand is a bit unique so i dont see how i can put in a sound bar (i have limited space in a condo for speakers)