Yamaha RX-V663 vs Onkyo STR-606

Could someone recommend me one of these over the other primarily for two channel listening?
Of course, I will also be using multichannel sources and HDMI and all that (reason to not get a stereo amp) but I mostly listen to music on my computer, outputted by optical to my current Harman/Kardon receiver. I am tryig to get a replacement for my birthday that can do all the new surround formats as well as sound hopefully better than my H/K AVR125.

How does my current receiver stack up to those sound quality wise?
 
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