I have an older H/K and have had no problems in 6 years. However, I have eliminated the H/K 254 and 354 from my search for a replacement because of HDMI handshake issues, especially with Motorola STBs and the PS3. The Onkyo 806 a very good receiver, but it's niche is HT, not music. It's a little dry in that area. If you really want a musical receiver I'd look at the Yamaha RX-V863 or the Pioneer Elite VSX-03TXH. The Yamaha is a little thin sounding but is a solid performer and the PE is strong all around.
Also, if you decide on the Onkyo, you might consider the Integra lineup. They are a bit more musical and have double the warranty.