Many reported HDMI failure with heat issues, which are generally thought to be the culprit. The 09 series, the current one, run much cooler. If concerned, go to a big box store that carries them and put your hand on a demo unit that's been on all day. I have and found them hardly warm at all.
They do have a rep for bad customer service though, can you find something from Denon or Yamaha? At the lower price points, they are all pretty close performance wise. Just decide on a feature set and see how much it'll cost from a few brands.
I have 2 Onkyos, an 04 and an 06. Both get warm so I placed fans on the back corner where the heat is generated on my big Onkyo, the 876. 3+ years with no issues.