i bought the 500 series, side by side comparison with the 530 and 550 and 580 series i could not tell the difference. i would have liked the 550 it added a usb port and another hdmi port for only 299 more but since the wife was paying she had the final say… also buy it from sears they had the best deal. 10% off any samsung tv $999 and up. i would have bought it from them but they were out of stock on it and most other models. seems everyone is buying tv’s now.