I had the Onkyo 601 for about 2 weeks, exchanged it for a Marantz 5400 because the 601 was very lackluster for music. But for HT, it'd be adequate and is very user-friendly, excellent manual.
The manufacturer refurb units I'd buy above others would be the Harman Kardon gear sold by Harman Direct on eBay. They are known for excellent service on returns and exchanges, and yes with full original warranty.
For $250 you should be able to get a HK 230/235 which would easily demolish the Onkyo for both music and movies.