Can I get a better picture using using a HDMI connection to DVI input on the 990 than I can with component video ?

Would I lose menu options on my Direct TV box and Oppo 980H if I did go with HDMI to DVI into the 990 then out from the 990 with component video to my display

Is there a adapter that goes from HDMI to D-Bus connection ?

. My Panasonic has one each, Component video , Composite Video , S Video, RS 232 and D-bus conection.

I know they make a HDMI to DVI connector, and a DVI to D-bus connector, but can not find a HDMI to D - bus