I have a PiPO M8Pro (probably a couple of years old now) that supports HDMI via a mini HDMI socket - I've regularly used it for HD video and internet TV onto a HD display . I think most of their current models still support HDMI.
Noticed this thread, and was just thinking about same question... Android tablets with hdmi output, preferably micro hdmi as I have the cable already, but obviously probably fairly cheap to get different kind. Anyone got any current suggestions? Thanks.