I know the 674 will transcode to HDMI, I'm not sure about the 605, I couldn't find the manual on-line. The 575 will only transcoed to component.
The Sony STR-DG910 will transcode to HDMI too, I *think* that the models form Yamaha, Denon and H/K that transcode to HDMI are not in the category of "cheapest".