Just about any 7.1 receiver with HDMI audio. Doesn't even have to be Onkyo, although the TX-SR606/605 will allow TrueHD over HDMI.
The HT-S790's receiver will do TrueHD over the analog audio inputs, but you'll need a player that has the corresponding outputs. Doesn't this model have those outputs? You may not have to buy anything but analog audio cables.
Don't believe everything on the Interwebz! A duck's quack DOES echo!