Arcam AVR500 vs. AVR600?

Just wanted to know if anyone can tell me what the difference is between the Atcam AVR500 and AVR600?
The 500 does not have the digital network card (Internet Radio, Streaming, and IP control capability) like the AVR 600. Furthermore, power output rating is reduced to 100w x 7 versus the AVR 600's more robust 120w x 7. Finally, pricing for the AVR500 is $3800 and AVR 600 is $5000.

I hope that helps!
You also lose multiroom connections and the copious video and audio outputs. However, for additional cost you can add network card for internet radio, streaming and IP control. Not sure how much the added cost is to the basic price and how much you really save.