Just noticed the Samsung 55JS8500 is on sale for the same price as the JU7500. It's supposed to be a step up in quality but it's a flat panel.
http://www.bestbuy.ca/en-CA/product/...45f306833een02
As for lag the JU7500 is rated excellent (20ms) on this site while the JS8500 is rated as great (36ms).
http://www.displaylag.com/display-database/