To RGB or not to RGB

[levi2000]

I'm a newbie here so go easy on me. Here is my setup:

Wall Mounted HDTV, Direct TV HD Cable, DVD Player (with HDMI out) and Yamaha tuner. The tuner is about 5-6 years old and does not have HDMI capability.

Now to my question... Should I run the DVD and Direct TV outs through RGB to the tuner and then from the tuner run RGB & RCA through the wall to the TV? Or should I invest in a rgb to dmi converter? Or should I just run HDMI from the DVD and Direct TV box through the wall straight to the TV and bypass the tuner altogether?

I am using the tv for the sound. No external speakers.

Thanks,