Hey Azure, I'd look for an entry level receiver with 3D capabilities. Even if you don't think you'll need the 3D it will assure you that the receiver is capable of doing what you need, such as having HDMI intake ports that will process the audio and ARC. Try looking at the Onkyo 309 or last years 308 or a similar product from say Pioneer (VSX 521 or last years 520]. These will both have digital connections[toslink] and regular connections.
http://www.hd.ca/onkyo/txsr309.php
This will give you an idea on the price.