PC Richard offers the LG 60" 600Hz 1080p Plasma HD Television, model no. 60PB5600, for $499.96 with free shipping. That's $160 below our mention from earlier today, which is bundled with a $200 Dell eGift Card, and the lowest total price we could find now by $190. It features a native resolution of 1920x1080 (1080p), 600Hz sub-field drive, USB, and one HDMI input.
Note that the Dell deal is still live if you don't mind paying more up front.