Just purchased my Samsung 60 JS8000 today from Best Buy here in Dallas. I returned (never opened) the Samsung 55 JS8500. The JS8000 from what I understand is a Best Buy exclusive from Samsung (if there is such a thing) with in store demos being featured exclusively in the Magnolia Theater Room in BB stores in approximately two weeks. I bought the only one they had in stock. If you Google for info or reviews on the JS8000 you won't find any, except for the one customer review on the BB website.
However, you will find information on the Samsung website for the JS8000 in both 55" and 65" respectively. This goes back to my comment about a BB exclusive, as it appears Samsung will be offering the 60" version at BB stores only. Strange I know, but until I am proven wrong I am going with that theory (a BB employee also provided me that answer.
With all that said, I am told the 60" JS8000 and 55" JS8500 are very similiar in features, with the JS8500 holding the edge with better Black levels and brighter/vibrant White levels. To me it's semantics, as I wanted a 60" and the Black/White levels are not a deal breaker for me.
I originally set out to purchase the 60" JS
7000, until I realized it was just 60hz (BTW no programming is broadcast above 60hz) so after numerous reviews and comparisons I chose the 55" JS8500, until I stumbled upon the 60" JS8000 by accident on the BB website.
I am in the middle of some home remodeling but will have my tv installed and ready to view on Saturday 10/24/14. Once I have time to watch some programming and of course some required sports, I will provide some feedback on this forum.