Fry's Electronic offers the LG 60" 600Hz 1080p WiFi Plasma HD Television, model no. 60PB5600, for $599 with free shipping. (Price shown at checkout.) That's the lowest total price we could find by $101. It features a native resolution of 1920x1080 (1080p), 600Hz sub-field drive, HDMI input, and USB input.
Update: Model number corrected.